63999731564552 has 32 divisors (see below), whose sum is σ = 137143496222400. Its totient is φ = 27428213525184.

The previous prime is 63999731564551. The next prime is 63999731564557. The reversal of 63999731564552 is 25546513799936.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 63999731564552.

It is not an unprimeable number, because it can be changed into a prime (63999731564551) 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, 1394363 + ... + 11399285.

It is an arithmetic number, because the mean of its divisors is an integer number (4285734256950).

Almost surely, 2^{63999731564552} is an apocalyptic number.

It is an amenable number.

63999731564552 is an abundant number, since it is smaller than the sum of its proper divisors (73143764657848).

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

63999731564552 is a wasteful number, since it uses less digits than its factorization.

63999731564552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10119165 (or 10119161 counting only the distinct ones).

The product of its digits is 1653372000, while the sum is 74.

The spelling of 63999731564552 in words is "sixty-three trillion, nine hundred ninety-nine billion, seven hundred thirty-one million, five hundred sixty-four thousand, five hundred fifty-two".