83645972538 has 32 divisors (see below), whose sum is σ = 168542247552. Its totient is φ = 27673920000.

The previous prime is 83645972537. The next prime is 83645972551. The reversal of 83645972538 is 83527954638.

It is a super-2 number, since 2×83645972538² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (83645972537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1049670 + ... + 1126542.

It is an arithmetic number, because the mean of its divisors is an integer number (5266945236).

Almost surely, 2^83645972538 is an apocalyptic number.

83645972538 is an abundant number, since it is smaller than the sum of its proper divisors (84896275014).

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

83645972538 is a wasteful number, since it uses less digits than its factorization.

83645972538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78230.

The product of its digits is 43545600, while the sum is 60.

The spelling of 83645972538 in words is "eighty-three billion, six hundred forty-five million, nine hundred seventy-two thousand, five hundred thirty-eight".