83891371564 has 96 divisors (see below), whose sum is σ = 203912755200. Its totient is φ = 29130312960.

The previous prime is 83891371561. The next prime is 83891371661. The reversal of 83891371564 is 46517319838.

It is not an unprimeable number, because it can be changed into a prime (83891371561) 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, 245124 + ... + 477355.

It is an arithmetic number, because the mean of its divisors is an integer number (2124091200).

Almost surely, 2^83891371564 is an apocalyptic number.

It is an amenable number.

83891371564 is an abundant number, since it is smaller than the sum of its proper divisors (120021383636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

83891371564 is a wasteful number, since it uses less digits than its factorization.

83891371564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722543 (or 722541 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 55.

The spelling of 83891371564 in words is "eighty-three billion, eight hundred ninety-one million, three hundred seventy-one thousand, five hundred sixty-four".