79547910491 has 4 divisors (see below), whose sum is σ = 90911897712. Its totient is φ = 68183923272.

The previous prime is 79547910487. The next prime is 79547910493. The reversal of 79547910491 is 19401974597.

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 79547910491 - 2² = 79547910487 is a prime.

It is a super-2 number, since 2×79547910491² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79547910493) 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, 5681993600 + ... + 5681993613.

It is an arithmetic number, because the mean of its divisors is an integer number (22727974428).

Almost surely, 2^79547910491 is an apocalyptic number.

79547910491 is a deficient number, since it is larger than the sum of its proper divisors (11363987221).

79547910491 is a wasteful number, since it uses less digits than its factorization.

79547910491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11363987220.

The product of its (nonzero) digits is 2857680, while the sum is 56.

The spelling of 79547910491 in words is "seventy-nine billion, five hundred forty-seven million, nine hundred ten thousand, four hundred ninety-one".