3665564618556 has 24 divisors (see below), whose sum is σ = 8564879796480. Its totient is φ = 1220155489072.

The previous prime is 3665564618489. The next prime is 3665564618587. The reversal of 3665564618556 is 6558164655663.

It is a congruent number.

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, 212413986 + ... + 212431241.

It is an arithmetic number, because the mean of its divisors is an integer number (356869991520).

Almost surely, 2^{3665564618556} is an apocalyptic number.

It is an amenable number.

3665564618556 is an abundant number, since it is smaller than the sum of its proper divisors (4899315177924).

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

3665564618556 is a wasteful number, since it uses less digits than its factorization.

3665564618556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424845953 (or 424845951 counting only the distinct ones).

The product of its digits is 466560000, while the sum is 66.

The spelling of 3665564618556 in words is "three trillion, six hundred sixty-five billion, five hundred sixty-four million, six hundred eighteen thousand, five hundred fifty-six".