51111562940 has 24 divisors (see below), whose sum is σ = 112983455760. Its totient is φ = 19368592128.

The previous prime is 51111562919. The next prime is 51111562951. The reversal of 51111562940 is 4926511115.

It is a super-2 number, since 2×51111562940² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51111562940.

It is a congruent 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, 67251677 + ... + 67252436.

It is an arithmetic number, because the mean of its divisors is an integer number (4707643990).

Almost surely, 2^51111562940 is an apocalyptic number.

It is an amenable number.

51111562940 is an abundant number, since it is smaller than the sum of its proper divisors (61871892820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51111562940 is a wasteful number, since it uses less digits than its factorization.

51111562940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134504141 (or 134504139 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 35.

The spelling of 51111562940 in words is "fifty-one billion, one hundred eleven million, five hundred sixty-two thousand, nine hundred forty".