51215733155 has 8 divisors (see below), whose sum is σ = 61461564912. Its totient is φ = 40970796448.

The previous prime is 51215733137. The next prime is 51215733199. The reversal of 51215733155 is 55133751215.

51215733155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51215733155 - 2⁶ = 51215733091 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90677 + ... + 332646.

It is an arithmetic number, because the mean of its divisors is an integer number (7682695614).

Almost surely, 2^51215733155 is an apocalyptic number.

51215733155 is a deficient number, since it is larger than the sum of its proper divisors (10245831757).

51215733155 is a wasteful number, since it uses less digits than its factorization.

51215733155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447525.

The product of its digits is 78750, while the sum is 38.

The spelling of 51215733155 in words is "fifty-one billion, two hundred fifteen million, seven hundred thirty-three thousand, one hundred fifty-five".