665169402556 has 12 divisors (see below), whose sum is σ = 1225312057480. Its totient is φ = 315080243280.

The previous prime is 665169402553. The next prime is 665169402581. The reversal of 665169402556 is 655204961566.

It is a junction number, because it is equal to n+sod(n) for n = 665169402497 and 665169402506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665169402553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4376114415 + ... + 4376114566.

Almost surely, 2^665169402556 is an apocalyptic number.

It is an amenable number.

665169402556 is a deficient number, since it is larger than the sum of its proper divisors (560142654924).

665169402556 is a wasteful number, since it uses less digits than its factorization.

665169402556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8752229004 (or 8752229002 counting only the distinct ones).

The product of its (nonzero) digits is 11664000, while the sum is 55.

The spelling of 665169402556 in words is "six hundred sixty-five billion, one hundred sixty-nine million, four hundred two thousand, five hundred fifty-six".