652660643691 has 80 divisors (see below), whose sum is σ = 1123805679040. Its totient is φ = 369761863680.

The previous prime is 652660643683. The next prime is 652660643753. The reversal of 652660643691 is 196346066256.

652660643691 is a `hidden beast` number, since 6 + 5 + 26 + 606 + 4 + 3 + 6 + 9 + 1 = 666.

It is not a de Polignac number, because 652660643691 - 2³ = 652660643683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (652660643641) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 31281735 + ... + 31302591.

It is an arithmetic number, because the mean of its divisors is an integer number (14047570988).

Almost surely, 2^652660643691 is an apocalyptic number.

652660643691 is a deficient number, since it is larger than the sum of its proper divisors (471145035349).

652660643691 is a wasteful number, since it uses less digits than its factorization.

652660643691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21346 (or 21337 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 54.

The spelling of 652660643691 in words is "six hundred fifty-two billion, six hundred sixty million, six hundred forty-three thousand, six hundred ninety-one".