64665755670 has 32 divisors (see below), whose sum is σ = 157067672832. Its totient is φ = 17036439392.

The previous prime is 64665755659. The next prime is 64665755681. The reversal of 64665755670 is 7655756646.

It is an interprime number because it is at equal distance from previous prime (64665755659) and next prime (64665755681).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64665755670.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12982602 + ... + 12987581.

It is an arithmetic number, because the mean of its divisors is an integer number (4908364776).

Almost surely, 2^64665755670 is an apocalyptic number.

64665755670 is an abundant number, since it is smaller than the sum of its proper divisors (92401917162).

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

64665755670 is a wasteful number, since it uses less digits than its factorization.

64665755670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25970276.

The product of its (nonzero) digits is 31752000, while the sum is 57.

The spelling of 64665755670 in words is "sixty-four billion, six hundred sixty-five million, seven hundred fifty-five thousand, six hundred seventy".