111666124257 has 16 divisors (see below), whose sum is σ = 151315057920. Its totient is φ = 73233646992.

The previous prime is 111666124247. The next prime is 111666124259. The reversal of 111666124257 is 752421666111.

It is not a de Polignac number, because 111666124257 - 2⁸ = 111666124001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111666124259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227343 + ... + 524420.

It is an arithmetic number, because the mean of its divisors is an integer number (9457191120).

Almost surely, 2^111666124257 is an apocalyptic number.

It is an amenable number.

111666124257 is a deficient number, since it is larger than the sum of its proper divisors (39648933663).

111666124257 is an equidigital number, since it uses as much as digits as its factorization.

111666124257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752572.

The product of its digits is 120960, while the sum is 42.

The spelling of 111666124257 in words is "one hundred eleven billion, six hundred sixty-six million, one hundred twenty-four thousand, two hundred fifty-seven".