666135555 has 16 divisors (see below), whose sum is σ = 1083290784. Its totient is φ = 349447680.

The previous prime is 666135529. The next prime is 666135563. The reversal of 666135555 is 555531666.

It is not a de Polignac number, because 666135555 - 2¹⁶ = 666070019 is a prime.

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, 363094 + ... + 364923.

It is an arithmetic number, because the mean of its divisors is an integer number (67705674).

Almost surely, 2^666135555 is an apocalyptic number.

666135555 is a deficient number, since it is larger than the sum of its proper divisors (417155229).

666135555 is a wasteful number, since it uses less digits than its factorization.

666135555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728086.

The product of its digits is 405000, while the sum is 42.

The square root of 666135555 is about 25809.6019922819. The cubic root of 666135555 is about 873.3484187159.

The spelling of 666135555 in words is "six hundred sixty-six million, one hundred thirty-five thousand, five hundred fifty-five".