51116505511 has 4 divisors (see below), whose sum is σ = 51121056024. Its totient is φ = 51111955000.

The previous prime is 51116505497. The next prime is 51116505521. The reversal of 51116505511 is 11550561115.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51116505511 - 2²³ = 51108116903 is a prime.

It is a super-2 number, since 2×51116505511² (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 (51116505521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2258365 + ... + 2280886.

It is an arithmetic number, because the mean of its divisors is an integer number (12780264006).

Almost surely, 2^51116505511 is an apocalyptic number.

51116505511 is a deficient number, since it is larger than the sum of its proper divisors (4550513).

51116505511 is a wasteful number, since it uses less digits than its factorization.

51116505511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4550512.

The product of its (nonzero) digits is 3750, while the sum is 31.

The spelling of 51116505511 in words is "fifty-one billion, one hundred sixteen million, five hundred five thousand, five hundred eleven".