79889526521 has 16 divisors (see below), whose sum is σ = 98497067904. Its totient is φ = 63232675584.

The previous prime is 79889526463. The next prime is 79889526547. The reversal of 79889526521 is 12562598897.

It is not a de Polignac number, because 79889526521 - 2²⁶ = 79822417657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79889526121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6327095 + ... + 6339708.

It is an arithmetic number, because the mean of its divisors is an integer number (6156066744).

Almost surely, 2^79889526521 is an apocalyptic number.

It is an amenable number.

79889526521 is a deficient number, since it is larger than the sum of its proper divisors (18607541383).

79889526521 is a wasteful number, since it uses less digits than its factorization.

79889526521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12666880.

The product of its digits is 21772800, while the sum is 62.

The spelling of 79889526521 in words is "seventy-nine billion, eight hundred eighty-nine million, five hundred twenty-six thousand, five hundred twenty-one".