51115500111 has 16 divisors (see below), whose sum is σ = 75380309984. Its totient is φ = 30605537664.

The previous prime is 51115500097. The next prime is 51115500119. The reversal of 51115500111 is 11100551115.

It is not a de Polignac number, because 51115500111 - 2⁹ = 51115499599 is a prime.

It is a super-2 number, since 2×51115500111² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51115500119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17710096 + ... + 17712981.

It is an arithmetic number, because the mean of its divisors is an integer number (4711269374).

Almost surely, 2^51115500111 is an apocalyptic number.

51115500111 is a deficient number, since it is larger than the sum of its proper divisors (24264809873).

51115500111 is a wasteful number, since it uses less digits than its factorization.

51115500111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35423130.

The product of its (nonzero) digits is 125, while the sum is 21.

The spelling of 51115500111 in words is "fifty-one billion, one hundred fifteen million, five hundred thousand, one hundred eleven".