3781946656612 has 6 divisors (see below), whose sum is σ = 6618406649078. Its totient is φ = 1890973328304.

The previous prime is 3781946656603. The next prime is 3781946656661. The reversal of 3781946656612 is 2166566491873.

It can be written as a sum of positive squares in only one way, i.e., 3093750316836 + 688196339776 = 1758906^2 + 829576^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 472743332073 + ... + 472743332080.

Almost surely, 2^{3781946656612} is an apocalyptic number.

It is an amenable number.

3781946656612 is a deficient number, since it is larger than the sum of its proper divisors (2836459992466).

3781946656612 is a wasteful number, since it uses less digits than its factorization.

3781946656612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945486664157 (or 945486664155 counting only the distinct ones).

The product of its digits is 78382080, while the sum is 64.

The spelling of 3781946656612 in words is "three trillion, seven hundred eighty-one billion, nine hundred forty-six million, six hundred fifty-six thousand, six hundred twelve".