79641057439 has 4 divisors (see below), whose sum is σ = 82210123840. Its totient is φ = 77071991040.

The previous prime is 79641057337. The next prime is 79641057451. The reversal of 79641057439 is 93475014697.

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-79641057439 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 79641057439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79641057499) 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 3 ways as a sum of consecutive naturals, for example, 1284533154 + ... + 1284533215.

It is an arithmetic number, because the mean of its divisors is an integer number (20552530960).

Almost surely, 2^79641057439 is an apocalyptic number.

79641057439 is a deficient number, since it is larger than the sum of its proper divisors (2569066401).

79641057439 is a wasteful number, since it uses less digits than its factorization.

79641057439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2569066400.

The product of its (nonzero) digits is 5715360, while the sum is 55.

The spelling of 79641057439 in words is "seventy-nine billion, six hundred forty-one million, fifty-seven thousand, four hundred thirty-nine".