51615000060565 has 4 divisors (see below), whose sum is σ = 61938000072684. Its totient is φ = 41292000048448.

The previous prime is 51615000060521. The next prime is 51615000060619. The reversal of 51615000060565 is 56506000051615.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29163380497969 + 22451619562596 = 5400313^2 + 4738314^2 .

It is a cyclic number.

It is not a de Polignac number, because 51615000060565 - 2³³ = 51606410125973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5161500006052 + ... + 5161500006061.

It is an arithmetic number, because the mean of its divisors is an integer number (15484500018171).

Almost surely, 2^{51615000060565} is an apocalyptic number.

It is an amenable number.

51615000060565 is a deficient number, since it is larger than the sum of its proper divisors (10323000012119).

51615000060565 is a wasteful number, since it uses less digits than its factorization.

51615000060565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10323000012118.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 51615000060565 in words is "fifty-one trillion, six hundred fifteen billion, sixty thousand, five hundred sixty-five".