666705038574 has 16 divisors (see below), whose sum is σ = 1338330412800. Its totient is φ = 221414956920.

The previous prime is 666705038551. The next prime is 666705038579. The reversal of 666705038574 is 475830507666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666705038579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205012224 + ... + 205015475.

It is an arithmetic number, because the mean of its divisors is an integer number (83645650800).

Almost surely, 2^666705038574 is an apocalyptic number.

666705038574 is an abundant number, since it is smaller than the sum of its proper divisors (671625374226).

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

666705038574 is a wasteful number, since it uses less digits than its factorization.

666705038574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410027975.

The product of its (nonzero) digits is 25401600, while the sum is 57.

The spelling of 666705038574 in words is "six hundred sixty-six billion, seven hundred five million, thirty-eight thousand, five hundred seventy-four".