791311518161 has 4 divisors (see below), whose sum is σ = 791362549824. Its totient is φ = 791260486500.

The previous prime is 791311518157. The next prime is 791311518167. The reversal of 791311518161 is 161815113197.

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, and also an emirpimes, since its reverse is a distinct semiprime: 161815113197 = 2131 ⋅75933887.

It is a cyclic number.

It is not a de Polignac number, because 791311518161 - 2² = 791311518157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (791311518167) 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, 25492565 + ... + 25523586.

It is an arithmetic number, because the mean of its divisors is an integer number (197840637456).

Almost surely, 2^791311518161 is an apocalyptic number.

It is an amenable number.

791311518161 is a deficient number, since it is larger than the sum of its proper divisors (51031663).

791311518161 is a wasteful number, since it uses less digits than its factorization.

791311518161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51031662.

The product of its digits is 45360, while the sum is 44.

The spelling of 791311518161 in words is "seven hundred ninety-one billion, three hundred eleven million, five hundred eighteen thousand, one hundred sixty-one".