111655666631 has 2 divisors, whose sum is σ = 111655666632. Its totient is φ = 111655666630.

The previous prime is 111655666609. The next prime is 111655666637. The reversal of 111655666631 is 136666556111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111655666631 - 2¹⁰ = 111655665607 is a prime.

It is a super-2 number, since 2×111655666631² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111655666637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55827833315 + 55827833316.

It is an arithmetic number, because the mean of its divisors is an integer number (55827833316).

Almost surely, 2^111655666631 is an apocalyptic number.

111655666631 is a deficient number, since it is larger than the sum of its proper divisors (1).

111655666631 is an equidigital number, since it uses as much as digits as its factorization.

111655666631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 47.

The spelling of 111655666631 in words is "one hundred eleven billion, six hundred fifty-five million, six hundred sixty-six thousand, six hundred thirty-one".