7981279810319 has 4 divisors (see below), whose sum is σ = 7981307401896. Its totient is φ = 7981252218744.

The previous prime is 7981279810313. The next prime is 7981279810337. The reversal of 7981279810319 is 9130189721897.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7981279810319 - 2¹⁶ = 7981279744783 is a prime.

It is a super-2 number, since 2×7981279810319² (a number of 27 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 (7981279810313) 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, 13357244 + ... + 13941969.

It is an arithmetic number, because the mean of its divisors is an integer number (1995326850474).

Almost surely, 2^{7981279810319} is an apocalyptic number.

7981279810319 is a deficient number, since it is larger than the sum of its proper divisors (27591577).

7981279810319 is a wasteful number, since it uses less digits than its factorization.

7981279810319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27591576.

The product of its (nonzero) digits is 13716864, while the sum is 65.

The spelling of 7981279810319 in words is "seven trillion, nine hundred eighty-one billion, two hundred seventy-nine million, eight hundred ten thousand, three hundred nineteen".