79921747834 has 16 divisors (see below), whose sum is σ = 121106775456. Its totient is φ = 39553066000.

The previous prime is 79921747813. The next prime is 79921747859. The reversal of 79921747834 is 43874712997.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 616989 + ... + 735199.

It is an arithmetic number, because the mean of its divisors is an integer number (7569173466).

Almost surely, 2^79921747834 is an apocalyptic number.

79921747834 is a deficient number, since it is larger than the sum of its proper divisors (41185027622).

79921747834 is a wasteful number, since it uses less digits than its factorization.

79921747834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121661.

The product of its digits is 21337344, while the sum is 61.

It can be divided in two parts, 7992174 and 7834, that added together give a palindrome (8000008).

The spelling of 79921747834 in words is "seventy-nine billion, nine hundred twenty-one million, seven hundred forty-seven thousand, eight hundred thirty-four".