82139423961 has 16 divisors (see below), whose sum is σ = 125168891264. Its totient is φ = 46935293184.

The previous prime is 82139423953. The next prime is 82139423981. The reversal of 82139423961 is 16932493128.

It is not a de Polignac number, because 82139423961 - 2³ = 82139423953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82139423961.

It is not an unprimeable number, because it can be changed into a prime (82139423911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1081155 + ... + 1154631.

It is an arithmetic number, because the mean of its divisors is an integer number (7823055704).

Almost surely, 2^82139423961 is an apocalyptic number.

It is an amenable number.

82139423961 is a deficient number, since it is larger than the sum of its proper divisors (43029467303).

82139423961 is a wasteful number, since it uses less digits than its factorization.

82139423961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126720.

The product of its digits is 559872, while the sum is 48.

The spelling of 82139423961 in words is "eighty-two billion, one hundred thirty-nine million, four hundred twenty-three thousand, nine hundred sixty-one".