63711573694209 has 63 divisors (see below), whose sum is σ = 107379512661187. Its totient is φ = 36401920151184.

The previous prime is 63711573694159. The next prime is 63711573694213. The reversal of 63711573694209 is 90249637511736.

It is a happy number.

The square root of 63711573694209 is 7981953.

It is a perfect power (a square), and thus also a powerful number.

63711573694209 is a `hidden beast` number, since 6 + 3 + 7 + 11 + 57 + 369 + 4 + 209 = 666.

63711573694209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 52403338170225 + 11308235523984 = 7239015^2 + 3362772^2 .

It is a tau number, because it is divible by the number of its divisors (63).

It is not a de Polignac number, because 63711573694209 - 2¹⁵ = 63711573661441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63711573694289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 8213425759 + ... + 8213433515.

Almost surely, 2^{63711573694209} is an apocalyptic number.

63711573694209 is the 7981953-rd square number.

63711573694209 is the 3990977-th centered octagonal number.

It is an amenable number.

63711573694209 is a deficient number, since it is larger than the sum of its proper divisors (43667938966978).

63711573694209 is an frugal number, since it uses more digits than its factorization.

63711573694209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15562 (or 7767 counting only the distinct ones).

The product of its (nonzero) digits is 51438240, while the sum is 63.

The spelling of 63711573694209 in words is "sixty-three trillion, seven hundred eleven billion, five hundred seventy-three million, six hundred ninety-four thousand, two hundred nine".