665355331556 has 24 divisors (see below), whose sum is σ = 1174466331360. Its totient is φ = 329800534272.

The previous prime is 665355331547. The next prime is 665355331561. The reversal of 665355331556 is 655133553566.

665355331556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×665355331556² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665355331498 and 665355331507.

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, 496301 + ... + 1255796.

It is an arithmetic number, because the mean of its divisors is an integer number (48936097140).

Almost surely, 2^665355331556 is an apocalyptic number.

It is an amenable number.

665355331556 is a deficient number, since it is larger than the sum of its proper divisors (509110999804).

665355331556 is a wasteful number, since it uses less digits than its factorization.

665355331556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752923 (or 1752921 counting only the distinct ones).

The product of its digits is 18225000, while the sum is 53.

The spelling of 665355331556 in words is "six hundred sixty-five billion, three hundred fifty-five million, three hundred thirty-one thousand, five hundred fifty-six".