64495664688 has 240 divisors, whose sum is σ = 209027811840. Its totient is φ = 16775755776.

The previous prime is 64495664609. The next prime is 64495664699. The reversal of 64495664688 is 88646659446.

64495664688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4137453 + ... + 4153011.

It is an arithmetic number, because the mean of its divisors is an integer number (870949216).

Almost surely, 2^64495664688 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 64495664688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104513905920).

64495664688 is an abundant number, since it is smaller than the sum of its proper divisors (144532147152).

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

64495664688 is a wasteful number, since it uses less digits than its factorization.

64495664688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15676 (or 15657 counting only the distinct ones).

The product of its digits is 238878720, while the sum is 66.

The spelling of 64495664688 in words is "sixty-four billion, four hundred ninety-five million, six hundred sixty-four thousand, six hundred eighty-eight".