64039794663936 has 640 divisors, whose sum is σ = 219385798410240. Its totient is φ = 16134660292608.

The previous prime is 64039794663899. The next prime is 64039794663947. The reversal of 64039794663936 is 63936649793046.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2600799721 + ... + 2600824343.

It is an arithmetic number, because the mean of its divisors is an integer number (342790310016).

Almost surely, 2^{64039794663936} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64039794663936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109692899205120).

64039794663936 is an abundant number, since it is smaller than the sum of its proper divisors (155346003746304).

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

64039794663936 is a wasteful number, since it uses less digits than its factorization.

64039794663936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25496 (or 25480 counting only the distinct ones).

The product of its (nonzero) digits is 2857026816, while the sum is 75.

The spelling of 64039794663936 in words is "sixty-four trillion, thirty-nine billion, seven hundred ninety-four million, six hundred sixty-three thousand, nine hundred thirty-six".