51006520065 has 64 divisors (see below), whose sum is σ = 86613940224. Its totient is φ = 25589760000.

The previous prime is 51006519997. The next prime is 51006520073. The reversal of 51006520065 is 56002560015.

It is not a de Polignac number, because 51006520065 - 2²⁵ = 50972965633 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5352505 + ... + 5362025.

It is an arithmetic number, because the mean of its divisors is an integer number (1353342816).

Almost surely, 2^51006520065 is an apocalyptic number.

It is an amenable number.

51006520065 is a deficient number, since it is larger than the sum of its proper divisors (35607420159).

51006520065 is a wasteful number, since it uses less digits than its factorization.

51006520065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9882.

The product of its (nonzero) digits is 9000, while the sum is 30.

The spelling of 51006520065 in words is "fifty-one billion, six million, five hundred twenty thousand, sixty-five".