79784893553121 has 45 divisors (see below), whose sum is σ = 120998438026851. Its totient is φ = 52392512330928.

The previous prime is 79784893553111. The next prime is 79784893553149. The reversal of 79784893553121 is 12135539848797.

It is a happy number.

The square root of 79784893553121 is 8932239.

It is a perfect power (a square), and thus also a powerful number.

79784893553121 is a `hidden beast` number, since 7 + 9 + 7 + 8 + 4 + 89 + 3 + 5 + 531 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23768111315025 + 56016782238096 = 4875255^2 + 7484436^2 .

It is a de Polignac number, because none of the positive numbers 2^k-79784893553121 is a prime.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 79784893553121.

It is not an unprimeable number, because it can be changed into a prime (79784893553111) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 5386132711 + ... + 5386147523.

Almost surely, 2^{79784893553121} is an apocalyptic number.

79784893553121 is the 8932239-th square number.

79784893553121 is the 4466120-th centered octagonal number.

It is an amenable number.

79784893553121 is a deficient number, since it is larger than the sum of its proper divisors (41213544473730).

79784893553121 is an frugal number, since it uses more digits than its factorization.

79784893553121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29772 (or 14883 counting only the distinct ones).

The product of its digits is 457228800, while the sum is 72.

The spelling of 79784893553121 in words is "seventy-nine trillion, seven hundred eighty-four billion, eight hundred ninety-three million, five hundred fifty-three thousand, one hundred twenty-one".