79427081397 has 4 divisors (see below), whose sum is σ = 105902775200. Its totient is φ = 52951387596.

The previous prime is 79427081341. The next prime is 79427081411. The reversal of 79427081397 is 79318072497.

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.

It is a de Polignac number, because none of the positive numbers 2^k-79427081397 is a prime.

It is a super-2 number, since 2×79427081397² (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 (79427081497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13237846897 + ... + 13237846902.

It is an arithmetic number, because the mean of its divisors is an integer number (26475693800).

Almost surely, 2^79427081397 is an apocalyptic number.

It is an amenable number.

79427081397 is a deficient number, since it is larger than the sum of its proper divisors (26475693803).

79427081397 is a wasteful number, since it uses less digits than its factorization.

79427081397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26475693802.

The product of its (nonzero) digits is 5334336, while the sum is 57.

The spelling of 79427081397 in words is "seventy-nine billion, four hundred twenty-seven million, eighty-one thousand, three hundred ninety-seven".