666593444 has 24 divisors (see below), whose sum is σ = 1273335168. Its totient is φ = 302819040.

The previous prime is 666593437. The next prime is 666593461. The reversal of 666593444 is 444395666.

It is a super-2 number, since 2×666593444² = 888693639167562272, which contains 22 as substring.

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, 97589 + ... + 104195.

It is an arithmetic number, because the mean of its divisors is an integer number (53055632).

Almost surely, 2^666593444 is an apocalyptic number.

It is an amenable number.

666593444 is a deficient number, since it is larger than the sum of its proper divisors (606741724).

666593444 is a wasteful number, since it uses less digits than its factorization.

666593444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8915 (or 8913 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 47.

The square root of 666593444 is about 25818.4709849363. The cubic root of 666593444 is about 873.5484806197.

The spelling of 666593444 in words is "six hundred sixty-six million, five hundred ninety-three thousand, four hundred forty-four".