3663656947820 has 48 divisors (see below), whose sum is σ = 7726330499328. Its totient is φ = 1459246584000.

The previous prime is 3663656947801. The next prime is 3663656947849. The reversal of 3663656947820 is 287496563663.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors.

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, 19721489 + ... + 19906391.

It is an arithmetic number, because the mean of its divisors is an integer number (160965218736).

Almost surely, 2^{3663656947820} is an apocalyptic number.

It is an amenable number.

3663656947820 is an abundant number, since it is smaller than the sum of its proper divisors (4062673551508).

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

3663656947820 is a wasteful number, since it uses less digits than its factorization.

3663656947820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189110 (or 189108 counting only the distinct ones).

The product of its (nonzero) digits is 235146240, while the sum is 65.

The spelling of 3663656947820 in words is "three trillion, six hundred sixty-three billion, six hundred fifty-six million, nine hundred forty-seven thousand, eight hundred twenty".