51111601560 has 64 divisors (see below), whose sum is σ = 170372008800. Its totient is φ = 13629760128.

The previous prime is 51111601547. The next prime is 51111601613. The reversal of 51111601560 is 6510611115.

51111601560 is a `hidden beast` number, since 5 + 1 + 1 + 1 + 1 + 601 + 56 + 0 = 666.

It is a super-2 number, since 2×51111601560² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23661699 + ... + 23663858.

Almost surely, 2^51111601560 is an apocalyptic number.

It is an amenable number.

51111601560 is an abundant number, since it is smaller than the sum of its proper divisors (119260407240).

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

51111601560 is a wasteful number, since it uses less digits than its factorization.

51111601560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47325577 (or 47325567 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

The spelling of 51111601560 in words is "fifty-one billion, one hundred eleven million, six hundred one thousand, five hundred sixty".