11722570661 has 4 divisors (see below), whose sum is σ = 11725500192. Its totient is φ = 11719641132.

The previous prime is 11722570631. The next prime is 11722570681. The reversal of 11722570661 is 16607522711.

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 11722570661 - 2¹⁰ = 11722569637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11722570631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1458755 + ... + 1466768.

It is an arithmetic number, because the mean of its divisors is an integer number (2931375048).

Almost surely, 2^11722570661 is an apocalyptic number.

It is an amenable number.

11722570661 is a deficient number, since it is larger than the sum of its proper divisors (2929531).

11722570661 is an equidigital number, since it uses as much as digits as its factorization.

11722570661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2929530.

The product of its (nonzero) digits is 35280, while the sum is 38.

The spelling of 11722570661 in words is "eleven billion, seven hundred twenty-two million, five hundred seventy thousand, six hundred sixty-one".