666805633574 has 8 divisors (see below), whose sum is σ = 1052851000440. Its totient is φ = 315855300096.

The previous prime is 666805633573. The next prime is 666805633591. The reversal of 666805633574 is 475336508666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666805633573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8773758299 + ... + 8773758374.

It is an arithmetic number, because the mean of its divisors is an integer number (131606375055).

Almost surely, 2^666805633574 is an apocalyptic number.

666805633574 is a deficient number, since it is larger than the sum of its proper divisors (386045366866).

666805633574 is a wasteful number, since it uses less digits than its factorization.

666805633574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17547516694.

The product of its (nonzero) digits is 65318400, while the sum is 59.

The spelling of 666805633574 in words is "six hundred sixty-six billion, eight hundred five million, six hundred thirty-three thousand, five hundred seventy-four".