51515565605 has 16 divisors (see below), whose sum is σ = 71349427584. Its totient is φ = 34975204800.

The previous prime is 51515565589. The next prime is 51515565617. The reversal of 51515565605 is 50656551515.

It is not a de Polignac number, because 51515565605 - 2⁴ = 51515565589 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 7282967 + ... + 7290036.

It is an arithmetic number, because the mean of its divisors is an integer number (4459339224).

Almost surely, 2^51515565605 is an apocalyptic number.

It is an amenable number.

51515565605 is a deficient number, since it is larger than the sum of its proper divisors (19833861979).

51515565605 is a wasteful number, since it uses less digits than its factorization.

51515565605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14573116.

The product of its (nonzero) digits is 562500, while the sum is 44.

The spelling of 51515565605 in words is "fifty-one billion, five hundred fifteen million, five hundred sixty-five thousand, six hundred five".