111660204857 has 2 divisors, whose sum is σ = 111660204858. Its totient is φ = 111660204856.

The previous prime is 111660204809. The next prime is 111660204869. The reversal of 111660204857 is 758402066111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111438462976 + 221741881 = 333824^2 + 14891^2 .

It is a cyclic number.

It is not a de Polignac number, because 111660204857 - 2¹² = 111660200761 is a prime.

It is not a weakly prime, because it can be changed into another prime (111660204157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55830102428 + 55830102429.

It is an arithmetic number, because the mean of its divisors is an integer number (55830102429).

Almost surely, 2^111660204857 is an apocalyptic number.

It is an amenable number.

111660204857 is a deficient number, since it is larger than the sum of its proper divisors (1).

111660204857 is an equidigital number, since it uses as much as digits as its factorization.

111660204857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 111660204857 in words is "one hundred eleven billion, six hundred sixty million, two hundred four thousand, eight hundred fifty-seven".