79861816897 has 4 divisors (see below), whose sum is σ = 79875306160. Its totient is φ = 79848327636.

The previous prime is 79861816891. The next prime is 79861816921.

79861816897 is nontrivially palindromic in base 10.

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 79861816897 - 2³ = 79861816889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79861816891) 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, 6735747 + ... + 6747592.

It is an arithmetic number, because the mean of its divisors is an integer number (19968826540).

Almost surely, 2^79861816897 is an apocalyptic number.

It is an amenable number.

79861816897 is a deficient number, since it is larger than the sum of its proper divisors (13489263).

79861816897 is a wasteful number, since it uses less digits than its factorization.

79861816897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13489262.

The product of its digits is 73156608, while the sum is 70.

The spelling of 79861816897 in words is "seventy-nine billion, eight hundred sixty-one million, eight hundred sixteen thousand, eight hundred ninety-seven".