51555615165 has 96 divisors (see below), whose sum is σ = 95664830976. Its totient is φ = 25594675200.

The previous prime is 51555615103. The next prime is 51555615173. The reversal of 51555615165 is 56151655515.

51555615165 is a `hidden beast` number, since 5 + 15 + 5 + 5 + 615 + 16 + 5 = 666.

It is not a de Polignac number, because 51555615165 - 2¹⁰ = 51555614141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 51555615165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 30379597 + ... + 30381293.

It is an arithmetic number, because the mean of its divisors is an integer number (996508656).

Almost surely, 2^51555615165 is an apocalyptic number.

It is an amenable number.

51555615165 is a deficient number, since it is larger than the sum of its proper divisors (44109215811).

51555615165 is a wasteful number, since it uses less digits than its factorization.

51555615165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139 (or 2136 counting only the distinct ones).

The product of its digits is 562500, while the sum is 45.

The spelling of 51555615165 in words is "fifty-one billion, five hundred fifty-five million, six hundred fifteen thousand, one hundred sixty-five".