11765722817 has 4 divisors (see below), whose sum is σ = 11778695856. Its totient is φ = 11752749780.

The previous prime is 11765722789. The next prime is 11765722873. The reversal of 11765722817 is 71822756711.

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: 71822756711 = 56473 ⋅1271807.

It is a cyclic number.

It is not a de Polignac number, because 11765722817 - 2¹² = 11765718721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11765722217) 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, 6485159 + ... + 6486972.

It is an arithmetic number, because the mean of its divisors is an integer number (2944673964).

Almost surely, 2^11765722817 is an apocalyptic number.

It is an amenable number.

11765722817 is a deficient number, since it is larger than the sum of its proper divisors (12973039).

11765722817 is an equidigital number, since it uses as much as digits as its factorization.

11765722817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12973038.

The product of its digits is 329280, while the sum is 47.

The spelling of 11765722817 in words is "eleven billion, seven hundred sixty-five million, seven hundred twenty-two thousand, eight hundred seventeen".