666440466 has 16 divisors (see below), whose sum is σ = 1403032800. Its totient is φ = 210454848.

The previous prime is 666440441. The next prime is 666440519. The reversal of 666440466 is 664044666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2922871 + ... + 2923098.

It is an arithmetic number, because the mean of its divisors is an integer number (87689550).

Almost surely, 2^666440466 is an apocalyptic number.

666440466 is an abundant number, since it is smaller than the sum of its proper divisors (736592334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666440466 is a wasteful number, since it uses less digits than its factorization.

666440466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5845993.

The product of its (nonzero) digits is 497664, while the sum is 42.

The square root of 666440466 is about 25815.5082460137. The cubic root of 666440466 is about 873.4816513179.

The spelling of 666440466 in words is "six hundred sixty-six million, four hundred forty thousand, four hundred sixty-six".