64633959936 has 640 divisors, whose sum is σ = 237584793600. Its totient is φ = 16894033920.

The previous prime is 64633959913. The next prime is 64633959953. The reversal of 64633959936 is 63995933646.

64633959936 is a `hidden beast` number, since 6 + 4 + 6 + 3 + 3 + 9 + 599 + 36 = 666.

64633959936 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

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, 240274810 + ... + 240275078.

It is an arithmetic number, because the mean of its divisors is an integer number (371226240).

Almost surely, 2^64633959936 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 64633959936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118792396800).

64633959936 is an abundant number, since it is smaller than the sum of its proper divisors (172950833664).

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

64633959936 is a wasteful number, since it uses less digits than its factorization.

64633959936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507 (or 485 counting only the distinct ones).

The product of its digits is 85030560, while the sum is 63.

The spelling of 64633959936 in words is "sixty-four billion, six hundred thirty-three million, nine hundred fifty-nine thousand, nine hundred thirty-six".