111655666657 has 2 divisors, whose sum is σ = 111655666658. Its totient is φ = 111655666656.

The previous prime is 111655666637. The next prime is 111655666739. The reversal of 111655666657 is 756666556111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106042060881 + 5613605776 = 325641^2 + 74924^2 .

It is a cyclic number.

It is not a de Polignac number, because 111655666657 - 2²³ = 111647278049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111655666598 and 111655666607.

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, 55827833328 + 55827833329.

It is an arithmetic number, because the mean of its divisors is an integer number (55827833329).

Almost surely, 2^111655666657 is an apocalyptic number.

It is an amenable number.

111655666657 is a deficient number, since it is larger than the sum of its proper divisors (1).

111655666657 is an equidigital number, since it uses as much as digits as its factorization.

111655666657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804000, while the sum is 55.

The spelling of 111655666657 in words is "one hundred eleven billion, six hundred fifty-five million, six hundred sixty-six thousand, six hundred fifty-seven".