79984661 has 4 divisors (see below), whose sum is σ = 84194400. Its totient is φ = 75774924.

The previous prime is 79984657. The next prime is 79984669. The reversal of 79984661 is 16648997.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16648997 = 19 ⋅876263.

It is a cyclic number.

It is not a de Polignac number, because 79984661 - 2² = 79984657 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 (79984669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2104841 + ... + 2104878.

It is an arithmetic number, because the mean of its divisors is an integer number (21048600).

Almost surely, 2^79984661 is an apocalyptic number.

It is an amenable number.

79984661 is a deficient number, since it is larger than the sum of its proper divisors (4209739).

79984661 is a wasteful number, since it uses less digits than its factorization.

79984661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209738.

The product of its digits is 653184, while the sum is 50.

The square root of 79984661 is about 8943.4143927250. The cubic root of 79984661 is about 430.8593971847.

The spelling of 79984661 in words is "seventy-nine million, nine hundred eighty-four thousand, six hundred sixty-one".