111111199957 has 2 divisors, whose sum is σ = 111111199958. Its totient is φ = 111111199956.

The previous prime is 111111199949. The next prime is 111111200021. The reversal of 111111199957 is 759991111111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104742202321 + 6368997636 = 323639^2 + 79806^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111199957 - 2³ = 111111199949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111111199057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555599978 + 55555599979.

It is an arithmetic number, because the mean of its divisors is an integer number (55555599979).

Almost surely, 2^111111199957 is an apocalyptic number.

It is an amenable number.

111111199957 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111199957 is an equidigital number, since it uses as much as digits as its factorization.

111111199957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25515, while the sum is 46.

The spelling of 111111199957 in words is "one hundred eleven billion, one hundred eleven million, one hundred ninety-nine thousand, nine hundred fifty-seven".