666973036394 has 32 divisors (see below), whose sum is σ = 1171639994112. Its totient is φ = 278785584000.

The previous prime is 666973036337. The next prime is 666973036417. The reversal of 666973036394 is 493630379666.

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, 1649564 + ... + 2013704.

It is an arithmetic number, because the mean of its divisors is an integer number (36613749816).

Almost surely, 2^666973036394 is an apocalyptic number.

666973036394 is a deficient number, since it is larger than the sum of its proper divisors (504666957718).

666973036394 is a wasteful number, since it uses less digits than its factorization.

666973036394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367382.

The product of its (nonzero) digits is 79361856, while the sum is 62.

The spelling of 666973036394 in words is "six hundred sixty-six billion, nine hundred seventy-three million, thirty-six thousand, three hundred ninety-four".