665868338376 has 32 divisors (see below), whose sum is σ = 1685742633600. Its totient is φ = 219146541120.

The previous prime is 665868338341. The next prime is 665868338431. The reversal of 665868338376 is 673833868566.

It is a super-3 number, since 3×665868338376³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665868338376.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175596295 + ... + 175600086.

It is an arithmetic number, because the mean of its divisors is an integer number (52679457300).

Almost surely, 2^665868338376 is an apocalyptic number.

It is an amenable number.

665868338376 is an abundant number, since it is smaller than the sum of its proper divisors (1019874295224).

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

665868338376 is a wasteful number, since it uses less digits than its factorization.

665868338376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351196469 (or 351196465 counting only the distinct ones).

The product of its digits is 627056640, while the sum is 69.

The spelling of 665868338376 in words is "six hundred sixty-five billion, eight hundred sixty-eight million, three hundred thirty-eight thousand, three hundred seventy-six".