63556665536 has 84 divisors (see below), whose sum is σ = 156078003312. Its totient is φ = 25143266304.

The previous prime is 63556665533. The next prime is 63556665539.

63556665536 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (63556665533) and next prime (63556665539).

It is a Harshad number since it is a multiple of its sum of digits (56).

It is not an unprimeable number, because it can be changed into a prime (63556665533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 344015 + ... + 495438.

It is an arithmetic number, because the mean of its divisors is an integer number (1858071468).

Almost surely, 2^63556665536 is an apocalyptic number.

It is an amenable number.

63556665536 is an abundant number, since it is smaller than the sum of its proper divisors (92521337776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63556665536 is a wasteful number, since it uses less digits than its factorization.

63556665536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839498 (or 839475 counting only the distinct ones).

The product of its digits is 43740000, while the sum is 56.

The spelling of 63556665536 in words is "sixty-three billion, five hundred fifty-six million, six hundred sixty-five thousand, five hundred thirty-six".