64599056640 has 216 divisors, whose sum is σ = 223766000640. Its totient is φ = 17206382592.

The previous prime is 64599056597. The next prime is 64599056677. The reversal of 64599056640 is 4665099546.

64599056640 is a `hidden beast` number, since 6 + 4 + 599 + 0 + 5 + 6 + 6 + 40 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11736129 + ... + 11741631.

Almost surely, 2^64599056640 is an apocalyptic number.

64599056640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64599056640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111883000320).

64599056640 is an abundant number, since it is smaller than the sum of its proper divisors (159166944000).

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

64599056640 is a wasteful number, since it uses less digits than its factorization.

64599056640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6549 (or 6532 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 54.

The spelling of 64599056640 in words is "sixty-four billion, five hundred ninety-nine million, fifty-six thousand, six hundred forty".