665597876 has 6 divisors (see below), whose sum is σ = 1164796290. Its totient is φ = 332798936.

The previous prime is 665597861. The next prime is 665597917. The reversal of 665597876 is 678795566.

It can be written as a sum of positive squares in only one way, i.e., 396965776 + 268632100 = 19924^2 + 16390^2 .

It is a super-2 number, since 2×665597876² = 886041065071422752, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83199731 + ... + 83199738.

It is an arithmetic number, because the mean of its divisors is an integer number (194132715).

Almost surely, 2^665597876 is an apocalyptic number.

It is an amenable number.

665597876 is a deficient number, since it is larger than the sum of its proper divisors (499198414).

665597876 is a wasteful number, since it uses less digits than its factorization.

665597876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166399473 (or 166399471 counting only the distinct ones).

The product of its digits is 19051200, while the sum is 59.

The square root of 665597876 is about 25799.1836304950. The cubic root of 665597876 is about 873.1133777145.

The spelling of 665597876 in words is "six hundred sixty-five million, five hundred ninety-seven thousand, eight hundred seventy-six".