666111122215 has 24 divisors (see below), whose sum is σ = 1014367367952. Its totient is φ = 415238100480.

The previous prime is 666111122207. The next prime is 666111122231. The reversal of 666111122215 is 512221111666.

666111122215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666111122215 - 2³ = 666111122207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123580074 + ... + 123585463.

It is an arithmetic number, because the mean of its divisors is an integer number (42265306998).

Almost surely, 2^666111122215 is an apocalyptic number.

666111122215 is a deficient number, since it is larger than the sum of its proper divisors (348256245737).

666111122215 is a wasteful number, since it uses less digits than its factorization.

666111122215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247165567 (or 247165560 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The spelling of 666111122215 in words is "six hundred sixty-six billion, one hundred eleven million, one hundred twenty-two thousand, two hundred fifteen".