79917481439 has 4 divisors (see below), whose sum is σ = 79918096656. Its totient is φ = 79916866224.

The previous prime is 79917481429. The next prime is 79917481451. The reversal of 79917481439 is 93418471997.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79917481439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79917481429) 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, 28094 + ... + 400779.

It is an arithmetic number, because the mean of its divisors is an integer number (19979524164).

Almost surely, 2^79917481439 is an apocalyptic number.

79917481439 is a deficient number, since it is larger than the sum of its proper divisors (615217).

79917481439 is a wasteful number, since it uses less digits than its factorization.

79917481439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615216.

The product of its digits is 13716864, while the sum is 62.

The spelling of 79917481439 in words is "seventy-nine billion, nine hundred seventeen million, four hundred eighty-one thousand, four hundred thirty-nine".