111564751957 has 2 divisors, whose sum is σ = 111564751958. Its totient is φ = 111564751956.

The previous prime is 111564751943. The next prime is 111564751999. The reversal of 111564751957 is 759157465111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86115250116 + 25449501841 = 293454^2 + 159529^2 .

It is a cyclic number.

It is not a de Polignac number, because 111564751957 - 2⁷ = 111564751829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111564751937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55782375978 + 55782375979.

It is an arithmetic number, because the mean of its divisors is an integer number (55782375979).

Almost surely, 2^111564751957 is an apocalyptic number.

It is an amenable number.

111564751957 is a deficient number, since it is larger than the sum of its proper divisors (1).

111564751957 is an equidigital number, since it uses as much as digits as its factorization.

111564751957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1323000, while the sum is 52.

The spelling of 111564751957 in words is "one hundred eleven billion, five hundred sixty-four million, seven hundred fifty-one thousand, nine hundred fifty-seven".