64565688125 has 10 divisors (see below), whose sum is σ = 80681284662. Its totient is φ = 51652550000.

The previous prime is 64565688079. The next prime is 64565688193. The reversal of 64565688125 is 52188656546.

It can be written as a sum of positive squares in 5 ways, for example, as 27488645209 + 37077042916 = 165797^2 + 192554^2 .

It is not a de Polignac number, because 64565688125 - 2³⁴ = 47385818941 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 51651926 + ... + 51653175.

Almost surely, 2^64565688125 is an apocalyptic number.

It is an amenable number.

64565688125 is a deficient number, since it is larger than the sum of its proper divisors (16115596537).

64565688125 is an equidigital number, since it uses as much as digits as its factorization.

64565688125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103305121 (or 103305106 counting only the distinct ones).

The product of its digits is 13824000, while the sum is 56.

The spelling of 64565688125 in words is "sixty-four billion, five hundred sixty-five million, six hundred eighty-eight thousand, one hundred twenty-five".