63956512561 has 8 divisors (see below), whose sum is σ = 65361464064. Its totient is φ = 62553401760.

The previous prime is 63956512553. The next prime is 63956512577. The reversal of 63956512561 is 16521565936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63956512561 - 2³ = 63956512553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63956512531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389805 + ... + 529018.

It is an arithmetic number, because the mean of its divisors is an integer number (8170183008).

Almost surely, 2^63956512561 is an apocalyptic number.

It is an amenable number.

63956512561 is a deficient number, since it is larger than the sum of its proper divisors (1404951503).

63956512561 is a wasteful number, since it uses less digits than its factorization.

63956512561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920351.

The product of its digits is 1458000, while the sum is 49.

The spelling of 63956512561 in words is "sixty-three billion, nine hundred fifty-six million, five hundred twelve thousand, five hundred sixty-one".