82179115561 has 9 divisors (see below), whose sum is σ = 83138662693. Its totient is φ = 81230527840.

The previous prime is 82179115547. The next prime is 82179115567. The reversal of 82179115561 is 16551197128.

The square root of 82179115561 is 286669.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 165611161 + 82013504400 = 12869^2 + 286380^2 .

It is not a de Polignac number, because 82179115561 - 2¹³ = 82179107369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82179115567) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 25511931 + ... + 25515151.

Almost surely, 2^82179115561 is an apocalyptic number.

82179115561 is the 286669-th square number.

82179115561 is the 143335-th centered octagonal number.

It is an amenable number.

82179115561 is a deficient number, since it is larger than the sum of its proper divisors (959547132).

82179115561 is an frugal number, since it uses more digits than its factorization.

82179115561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6620 (or 3310 counting only the distinct ones).

The product of its digits is 151200, while the sum is 46.

The spelling of 82179115561 in words is "eighty-two billion, one hundred seventy-nine million, one hundred fifteen thousand, five hundred sixty-one".