3765640621671 has 20 divisors (see below), whose sum is σ = 5956111312272. Its totient is φ = 2362754899008.

The previous prime is 3765640621663. The next prime is 3765640621679. The reversal of 3765640621671 is 1761260465673.

3765640621671 is a `hidden beast` number, since 3 + 7 + 6 + 5 + 6 + 4 + 0 + 621 + 6 + 7 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (3765640621663) and next prime (3765640621679).

It is not a de Polignac number, because 3765640621671 - 2³ = 3765640621663 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3765640621679) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1367333635 + ... + 1367336388.

Almost surely, 2^{3765640621671} is an apocalyptic number.

3765640621671 is a deficient number, since it is larger than the sum of its proper divisors (2190470690601).

3765640621671 is a wasteful number, since it uses less digits than its factorization.

3765640621671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2734670052 (or 2734670043 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 54.

The spelling of 3765640621671 in words is "three trillion, seven hundred sixty-five billion, six hundred forty million, six hundred twenty-one thousand, six hundred seventy-one".