665777897328 has 20 divisors (see below), whose sum is σ = 1719926234888. Its totient is φ = 221925965760.

The previous prime is 665777897261. The next prime is 665777897339. The reversal of 665777897328 is 823798777566.

It is a super-3 number, since 3×665777897328³ (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 665777897328.

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, 6935186383 + ... + 6935186478.

Almost surely, 2^665777897328 is an apocalyptic number.

It is an amenable number.

665777897328 is an abundant number, since it is smaller than the sum of its proper divisors (1054148337560).

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

665777897328 is a wasteful number, since it uses less digits than its factorization.

665777897328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13870372872 (or 13870372866 counting only the distinct ones).

The product of its digits is 1493614080, while the sum is 75.

The spelling of 665777897328 in words is "six hundred sixty-five billion, seven hundred seventy-seven million, eight hundred ninety-seven thousand, three hundred twenty-eight".