79326624581 has 4 divisors (see below), whose sum is σ = 81014425152. Its totient is φ = 77638824012.

The previous prime is 79326624577. The next prime is 79326624583. The reversal of 79326624581 is 18542662397.

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: 18542662397 = 7 ⋅2648951771.

It is a cyclic number.

It is not a de Polignac number, because 79326624581 - 2² = 79326624577 is a prime.

It is a super-2 number, since 2×79326624581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79326624583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 843900215 + ... + 843900308.

It is an arithmetic number, because the mean of its divisors is an integer number (20253606288).

Almost surely, 2^79326624581 is an apocalyptic number.

It is an amenable number.

79326624581 is a deficient number, since it is larger than the sum of its proper divisors (1687800571).

79326624581 is a wasteful number, since it uses less digits than its factorization.

79326624581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687800570.

The product of its digits is 4354560, while the sum is 53.

The spelling of 79326624581 in words is "seventy-nine billion, three hundred twenty-six million, six hundred twenty-four thousand, five hundred eighty-one".