51115516111 has 8 divisors (see below), whose sum is σ = 55864329984. Its totient is φ = 46383693720.

The previous prime is 51115516093. The next prime is 51115516121. The reversal of 51115516111 is 11161551115.

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 51115516111 - 2⁵ = 51115516079 is a prime.

It is a super-2 number, since 2×51115516111² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51115516111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51115516121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4241575 + ... + 4253608.

It is an arithmetic number, because the mean of its divisors is an integer number (6983041248).

Almost surely, 2^51115516111 is an apocalyptic number.

51115516111 is a deficient number, since it is larger than the sum of its proper divisors (4748813873).

51115516111 is a wasteful number, since it uses less digits than its factorization.

51115516111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8495741.

The product of its digits is 750, while the sum is 28.

The spelling of 51115516111 in words is "fifty-one billion, one hundred fifteen million, five hundred sixteen thousand, one hundred eleven".