666394862 has 32 divisors (see below), whose sum is σ = 1160248320. Its totient is φ = 281155680.

The previous prime is 666394843. The next prime is 666394873. The reversal of 666394862 is 268493666.

666394862 = 319² + 320² + ... + 1266².

It is a super-2 number, since 2×666394862² = 888164224199998088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666394862.

It is a congruent number.

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, 509213 + ... + 510519.

It is an arithmetic number, because the mean of its divisors is an integer number (36257760).

Almost surely, 2^666394862 is an apocalyptic number.

666394862 is a deficient number, since it is larger than the sum of its proper divisors (493853458).

666394862 is a wasteful number, since it uses less digits than its factorization.

666394862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856.

The product of its digits is 2239488, while the sum is 50.

The square root of 666394862 is about 25814.6249633807. The cubic root of 666394862 is about 873.4617269746.

The spelling of 666394862 in words is "six hundred sixty-six million, three hundred ninety-four thousand, eight hundred sixty-two".