82438243691 has 4 divisors (see below), whose sum is σ = 82476750384. Its totient is φ = 82399737000.

The previous prime is 82438243621. The next prime is 82438243709. The reversal of 82438243691 is 19634283428.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82438243691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82438243621) 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, 19250135 + ... + 19254416.

It is an arithmetic number, because the mean of its divisors is an integer number (20619187596).

Almost surely, 2^82438243691 is an apocalyptic number.

82438243691 is a deficient number, since it is larger than the sum of its proper divisors (38506693).

82438243691 is a wasteful number, since it uses less digits than its factorization.

82438243691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38506692.

The product of its digits is 1990656, while the sum is 50.

The spelling of 82438243691 in words is "eighty-two billion, four hundred thirty-eight million, two hundred forty-three thousand, six hundred ninety-one".