666977050885 has 4 divisors (see below), whose sum is σ = 800372461068. Its totient is φ = 533581640704.

The previous prime is 666977050787. The next prime is 666977050931. The reversal of 666977050885 is 588050779666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 391092639876 + 275884411009 = 625374^2 + 525247^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666977050885 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666977050885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66697705084 + ... + 66697705093.

It is an arithmetic number, because the mean of its divisors is an integer number (200093115267).

Almost surely, 2^666977050885 is an apocalyptic number.

It is an amenable number.

666977050885 is a deficient number, since it is larger than the sum of its proper divisors (133395410183).

666977050885 is a wasteful number, since it uses less digits than its factorization.

666977050885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133395410182.

The product of its (nonzero) digits is 152409600, while the sum is 67.

The spelling of 666977050885 in words is "six hundred sixty-six billion, nine hundred seventy-seven million, fifty thousand, eight hundred eighty-five".