79181816502 has 16 divisors (see below), whose sum is σ = 165249008640. Its totient is φ = 25246376232.

The previous prime is 79181816491. The next prime is 79181816507. The reversal of 79181816502 is 20561818197.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79181816507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286890502 + ... + 286890777.

It is an arithmetic number, because the mean of its divisors is an integer number (10328063040).

Almost surely, 2^79181816502 is an apocalyptic number.

79181816502 is an abundant number, since it is smaller than the sum of its proper divisors (86067192138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79181816502 is a wasteful number, since it uses less digits than its factorization.

79181816502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573781307.

The product of its (nonzero) digits is 241920, while the sum is 48.

The spelling of 79181816502 in words is "seventy-nine billion, one hundred eighty-one million, eight hundred sixteen thousand, five hundred two".