63713561381 has 4 divisors (see below), whose sum is σ = 63902622732. Its totient is φ = 63524500032.

The previous prime is 63713561371. The next prime is 63713561399. The reversal of 63713561381 is 18316531736.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28591428100 + 35122133281 = 169090^2 + 187409^2 .

It is a cyclic number.

It is not a de Polignac number, because 63713561381 - 2²⁶ = 63646452517 is a prime.

It is a super-2 number, since 2×63713561381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63713561371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94530170 + ... + 94530843.

It is an arithmetic number, because the mean of its divisors is an integer number (15975655683).

Almost surely, 2^63713561381 is an apocalyptic number.

It is an amenable number.

63713561381 is a deficient number, since it is larger than the sum of its proper divisors (189061351).

63713561381 is a wasteful number, since it uses less digits than its factorization.

63713561381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189061350.

The product of its digits is 272160, while the sum is 44.

The spelling of 63713561381 in words is "sixty-three billion, seven hundred thirteen million, five hundred sixty-one thousand, three hundred eighty-one".