79672491391 has 4 divisors (see below), whose sum is σ = 81525340072. Its totient is φ = 77819642712.

The previous prime is 79672491383. The next prime is 79672491403. The reversal of 79672491391 is 19319427697.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19319427697 = 227 ⋅85107611.

It is a cyclic number.

It is not a de Polignac number, because 79672491391 - 2³ = 79672491383 is a prime.

It is a super-2 number, since 2×79672491391² (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 (79672491791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 926424276 + ... + 926424361.

It is an arithmetic number, because the mean of its divisors is an integer number (20381335018).

Almost surely, 2^79672491391 is an apocalyptic number.

79672491391 is a deficient number, since it is larger than the sum of its proper divisors (1852848681).

79672491391 is a wasteful number, since it uses less digits than its factorization.

79672491391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852848680.

The product of its digits is 5143824, while the sum is 58.

The spelling of 79672491391 in words is "seventy-nine billion, six hundred seventy-two million, four hundred ninety-one thousand, three hundred ninety-one".