82505979531 has 12 divisors (see below), whose sum is σ = 121710949152. Its totient is φ = 53833688496.

The previous prime is 82505979527. The next prime is 82505979553. The reversal of 82505979531 is 13597950528.

82505979531 is a `hidden beast` number, since 8 + 2 + 50 + 59 + 7 + 9 + 531 = 666.

It is not a de Polignac number, because 82505979531 - 2² = 82505979527 is a prime.

It is a super-2 number, since 2×82505979531² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82505979131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97524376 + ... + 97525221.

It is an arithmetic number, because the mean of its divisors is an integer number (10142579096).

Almost surely, 2^82505979531 is an apocalyptic number.

82505979531 is a deficient number, since it is larger than the sum of its proper divisors (39204969621).

82505979531 is a wasteful number, since it uses less digits than its factorization.

82505979531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195049650 (or 195049647 counting only the distinct ones).

The product of its (nonzero) digits is 3402000, while the sum is 54.

The spelling of 82505979531 in words is "eighty-two billion, five hundred five million, nine hundred seventy-nine thousand, five hundred thirty-one".