8172160643691 has 32 divisors (see below), whose sum is σ = 13902665644800. Its totient is φ = 4692149648640.

The previous prime is 8172160643683. The next prime is 8172160643737. The reversal of 8172160643691 is 1963460612718.

8172160643691 is a `hidden beast` number, since 8 + 1 + 7 + 21 + 606 + 4 + 3 + 6 + 9 + 1 = 666.

It is not a de Polignac number, because 8172160643691 - 2³ = 8172160643683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8172160643651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 724091526 + ... + 724102811.

It is an arithmetic number, because the mean of its divisors is an integer number (434458301400).

Almost surely, 2^{8172160643691} is an apocalyptic number.

8172160643691 is a deficient number, since it is larger than the sum of its proper divisors (5730505001109).

8172160643691 is a wasteful number, since it uses less digits than its factorization.

8172160643691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448194376 (or 1448194370 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 8172160643691 in words is "eight trillion, one hundred seventy-two billion, one hundred sixty million, six hundred forty-three thousand, six hundred ninety-one".