666104215 has 24 divisors (see below), whose sum is σ = 921371040. Its totient is φ = 452861760.

The previous prime is 666104209. The next prime is 666104237. The reversal of 666104215 is 512401666.

It is not a de Polignac number, because 666104215 - 2³ = 666104207 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 600081 + ... + 601189.

It is an arithmetic number, because the mean of its divisors is an integer number (38390460).

Almost surely, 2^666104215 is an apocalyptic number.

666104215 is a deficient number, since it is larger than the sum of its proper divisors (255266825).

666104215 is a wasteful number, since it uses less digits than its factorization.

666104215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383 (or 1252 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 666104215 is about 25808.9948467584. The cubic root of 666104215 is about 873.3347222200.

The spelling of 666104215 in words is "six hundred sixty-six million, one hundred four thousand, two hundred fifteen".