3656818978864 has 80 divisors (see below), whose sum is σ = 7375477653504. Its totient is φ = 1754526758400.

The previous prime is 3656818978859. The next prime is 3656818978961. The reversal of 3656818978864 is 4688798186563.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29590707 + ... + 29714029.

Almost surely, 2^{3656818978864} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3656818978864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3687738826752).

3656818978864 is an abundant number, since it is smaller than the sum of its proper divisors (3718658674640).

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

3656818978864 is a wasteful number, since it uses less digits than its factorization.

3656818978864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123866 (or 123860 counting only the distinct ones).

The product of its digits is 3344302080, while the sum is 79.

The spelling of 3656818978864 in words is "three trillion, six hundred fifty-six billion, eight hundred eighteen million, nine hundred seventy-eight thousand, eight hundred sixty-four".