51111660567 has 16 divisors (see below), whose sum is σ = 76073171328. Its totient is φ = 30256373280.

The previous prime is 51111660563. The next prime is 51111660617. The reversal of 51111660567 is 76506611115.

It is not a de Polignac number, because 51111660567 - 2² = 51111660563 is a prime.

It is a super-2 number, since 2×51111660567² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51111660563) 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, 18008328 + ... + 18011165.

It is an arithmetic number, because the mean of its divisors is an integer number (4754573208).

Almost surely, 2^51111660567 is an apocalyptic number.

51111660567 is a deficient number, since it is larger than the sum of its proper divisors (24961510761).

51111660567 is a wasteful number, since it uses less digits than its factorization.

51111660567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36019550.

The product of its (nonzero) digits is 37800, while the sum is 39.

The spelling of 51111660567 in words is "fifty-one billion, one hundred eleven million, six hundred sixty thousand, five hundred sixty-seven".