666555104 has 24 divisors (see below), whose sum is σ = 1316519568. Its totient is φ = 332200960.

The previous prime is 666555089. The next prime is 666555121. The reversal of 666555104 is 401555666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23537 + ... + 43440.

It is an arithmetic number, because the mean of its divisors is an integer number (54854982).

Almost surely, 2^666555104 is an apocalyptic number.

It is an amenable number.

666555104 is a deficient number, since it is larger than the sum of its proper divisors (649964464).

666555104 is a wasteful number, since it uses less digits than its factorization.

666555104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67298 (or 67290 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The square root of 666555104 is about 25817.7284825757. The cubic root of 666555104 is about 873.5317325348.

The spelling of 666555104 in words is "six hundred sixty-six million, five hundred fifty-five thousand, one hundred four".