63516213217 has 4 divisors (see below), whose sum is σ = 64557462676. Its totient is φ = 62474963760.

The previous prime is 63516213209. The next prime is 63516213227. The reversal of 63516213217 is 71231261536.

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 11495270656 + 52020942561 = 107216^2 + 228081^2 .

It is a cyclic number.

It is not a de Polignac number, because 63516213217 - 2³ = 63516213209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63516213227) 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 3 ways as a sum of consecutive naturals, for example, 520624638 + ... + 520624759.

It is an arithmetic number, because the mean of its divisors is an integer number (16139365669).

Almost surely, 2^63516213217 is an apocalyptic number.

It is an amenable number.

63516213217 is a deficient number, since it is larger than the sum of its proper divisors (1041249459).

63516213217 is a wasteful number, since it uses less digits than its factorization.

63516213217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041249458.

The product of its digits is 45360, while the sum is 37.

The spelling of 63516213217 in words is "sixty-three billion, five hundred sixteen million, two hundred thirteen thousand, two hundred seventeen".