79426363981 has 4 divisors (see below), whose sum is σ = 80772573600. Its totient is φ = 78080154364.

The previous prime is 79426363909. The next prime is 79426363997. The reversal of 79426363981 is 18936362497.

It is a happy number.

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 cyclic number.

It is not a de Polignac number, because 79426363981 - 2⁷ = 79426363853 is a prime.

It is a super-2 number, since 2×79426363981² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79426363481) 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, 673104721 + ... + 673104838.

It is an arithmetic number, because the mean of its divisors is an integer number (20193143400).

Almost surely, 2^79426363981 is an apocalyptic number.

It is an amenable number.

79426363981 is a deficient number, since it is larger than the sum of its proper divisors (1346209619).

79426363981 is a wasteful number, since it uses less digits than its factorization.

79426363981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346209618.

The product of its digits is 11757312, while the sum is 58.

The spelling of 79426363981 in words is "seventy-nine billion, four hundred twenty-six million, three hundred sixty-three thousand, nine hundred eighty-one".