111666100655 has 16 divisors (see below), whose sum is σ = 140374684800. Its totient is φ = 85160624640.

The previous prime is 111666100643. The next prime is 111666100661. The reversal of 111666100655 is 556001666111.

It is not a de Polignac number, because 111666100655 - 2⁴ = 111666100639 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4862666 + ... + 4885575.

It is an arithmetic number, because the mean of its divisors is an integer number (8773417800).

Almost surely, 2^111666100655 is an apocalyptic number.

111666100655 is a deficient number, since it is larger than the sum of its proper divisors (28708584145).

111666100655 is an equidigital number, since it uses as much as digits as its factorization.

111666100655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9748354.

The product of its (nonzero) digits is 32400, while the sum is 38.

Adding to 111666100655 its reverse (556001666111), we get a palindrome (667667766766).

The spelling of 111666100655 in words is "one hundred eleven billion, six hundred sixty-six million, one hundred thousand, six hundred fifty-five".