82439908861 has 4 divisors (see below), whose sum is σ = 82441338300. Its totient is φ = 82438479424.

The previous prime is 82439908847. The next prime is 82439908909. The reversal of 82439908861 is 16880993428.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3419325625 + 79020583236 = 58475^2 + 281106^2 .

It is a cyclic number.

It is not a de Polignac number, because 82439908861 - 2²⁹ = 81903037949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82439908796 and 82439908805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82439905861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624406 + ... + 744823.

It is an arithmetic number, because the mean of its divisors is an integer number (20610334575).

Almost surely, 2^82439908861 is an apocalyptic number.

It is an amenable number.

82439908861 is a deficient number, since it is larger than the sum of its proper divisors (1429439).

82439908861 is a wasteful number, since it uses less digits than its factorization.

82439908861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429438.

The product of its (nonzero) digits is 5971968, while the sum is 58.

The spelling of 82439908861 in words is "eighty-two billion, four hundred thirty-nine million, nine hundred eight thousand, eight hundred sixty-one".