51566812155 has 36 divisors (see below), whose sum is σ = 94334441760. Its totient is φ = 26054802144.

The previous prime is 51566812133. The next prime is 51566812189. The reversal of 51566812155 is 55121866515.

51566812155 is a `hidden beast` number, since 5 + 1 + 566 + 81 + 2 + 1 + 5 + 5 = 666.

It is not a de Polignac number, because 51566812155 - 2¹⁵ = 51566779387 is a prime.

It is a super-2 number, since 2×51566812155² (a number of 22 digits) contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 51566812155.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1570915 + ... + 1603404.

It is an arithmetic number, because the mean of its divisors is an integer number (2620401160).

Almost surely, 2^51566812155 is an apocalyptic number.

51566812155 is a deficient number, since it is larger than the sum of its proper divisors (42767629605).

51566812155 is a wasteful number, since it uses less digits than its factorization.

51566812155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174368 (or 3174346 counting only the distinct ones).

The product of its digits is 360000, while the sum is 45.

The spelling of 51566812155 in words is "fifty-one billion, five hundred sixty-six million, eight hundred twelve thousand, one hundred fifty-five".