51115534155 has 24 divisors (see below), whose sum is σ = 101257439712. Its totient is φ = 23367101184.

The previous prime is 51115534139. The next prime is 51115534157. The reversal of 51115534155 is 55143551115.

51115534155 is a `hidden beast` number, since 5 + 1 + 11 + 553 + 41 + 55 = 666.

It is not a de Polignac number, because 51115534155 - 2⁴ = 51115534139 is a prime.

It is a super-2 number, since 2×51115534155² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51115534157) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81135454 + ... + 81136083.

It is an arithmetic number, because the mean of its divisors is an integer number (4219059988).

Almost surely, 2^51115534155 is an apocalyptic number.

51115534155 is a deficient number, since it is larger than the sum of its proper divisors (50141905557).

51115534155 is a wasteful number, since it uses less digits than its factorization.

51115534155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162271555 (or 162271552 counting only the distinct ones).

The product of its digits is 37500, while the sum is 36.

The spelling of 51115534155 in words is "fifty-one billion, one hundred fifteen million, five hundred thirty-four thousand, one hundred fifty-five".