63956900421 has 24 divisors (see below), whose sum is σ = 98356900824. Its totient is φ = 39908090880.

The previous prime is 63956900419. The next prime is 63956900429. The reversal of 63956900421 is 12400965936.

63956900421 is a `hidden beast` number, since 63 + 9 + 569 + 0 + 0 + 4 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3237041025 + 60719859396 = 56895^2 + 246414^2 .

It is not a de Polignac number, because 63956900421 - 2¹ = 63956900419 is a prime.

It is a super-2 number, since 2×63956900421² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63956900429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1127056 + ... + 1182441.

It is an arithmetic number, because the mean of its divisors is an integer number (4098204201).

Almost surely, 2^63956900421 is an apocalyptic number.

It is an amenable number.

63956900421 is a deficient number, since it is larger than the sum of its proper divisors (34400000403).

63956900421 is a wasteful number, since it uses less digits than its factorization.

63956900421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309701 (or 2309698 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The spelling of 63956900421 in words is "sixty-three billion, nine hundred fifty-six million, nine hundred thousand, four hundred twenty-one".