665636388474 has 32 divisors (see below), whose sum is σ = 1354670000640. Its totient is φ = 217983888432.

The previous prime is 665636388449. The next prime is 665636388539. The reversal of 665636388474 is 474883636566.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1894 + ... + 1153809.

It is an arithmetic number, because the mean of its divisors is an integer number (42333437520).

Almost surely, 2^665636388474 is an apocalyptic number.

665636388474 is an abundant number, since it is smaller than the sum of its proper divisors (689033612166).

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

665636388474 is a wasteful number, since it uses less digits than its factorization.

665636388474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157394.

The product of its digits is 418037760, while the sum is 66.

The spelling of 665636388474 in words is "six hundred sixty-five billion, six hundred thirty-six million, three hundred eighty-eight thousand, four hundred seventy-four".