3866991556804 has 12 divisors (see below), whose sum is σ = 6767440890028. Its totient is φ = 1933437016800.

The previous prime is 3866991556787. The next prime is 3866991556823. The reversal of 3866991556804 is 4086551996683.

It can be written as a sum of positive squares in 2 ways, for example, as 3422500000000 + 444491556804 = 1850000^2 + 666702^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14542167 + ... + 14805694.

Almost surely, 2^{3866991556804} is an apocalyptic number.

It is an amenable number.

3866991556804 is a deficient number, since it is larger than the sum of its proper divisors (2900449333224).

3866991556804 is a wasteful number, since it uses less digits than its factorization.

3866991556804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29380806 (or 29380804 counting only the distinct ones).

The product of its (nonzero) digits is 335923200, while the sum is 70.

The spelling of 3866991556804 in words is "three trillion, eight hundred sixty-six billion, nine hundred ninety-one million, five hundred fifty-six thousand, eight hundred four".