51550166599565 has 16 divisors (see below), whose sum is σ = 65280020113920. Its totient is φ = 38971187830080.

The previous prime is 51550166599553. The next prime is 51550166599649. The reversal of 51550166599565 is 56599566105515.

It is not a de Polignac number, because 51550166599565 - 2¹⁶ = 51550166534029 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51550166599495 and 51550166599504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 683379581 + ... + 683455010.

It is an arithmetic number, because the mean of its divisors is an integer number (4080001257120).

Almost surely, 2^{51550166599565} is an apocalyptic number.

It is an amenable number.

51550166599565 is a deficient number, since it is larger than the sum of its proper divisors (13729853514355).

51550166599565 is a wasteful number, since it uses less digits than its factorization.

51550166599565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366835012.

The product of its (nonzero) digits is 273375000, while the sum is 68.

The spelling of 51550166599565 in words is "fifty-one trillion, five hundred fifty billion, one hundred sixty-six million, five hundred ninety-nine thousand, five hundred sixty-five".