22691661 has 4 divisors (see below), whose sum is σ = 30255552. Its totient is φ = 15127772.

The previous prime is 22691653. The next prime is 22691687. The reversal of 22691661 is 16619622.

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 22691661 - 2³ = 22691653 is a prime.

It is a super-2 number, since 2×22691661² = 1029822957877842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22691161) 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, 3781941 + ... + 3781946.

It is an arithmetic number, because the mean of its divisors is an integer number (7563888).

Almost surely, 2^22691661 is an apocalyptic number.

It is an amenable number.

22691661 is a deficient number, since it is larger than the sum of its proper divisors (7563891).

22691661 is an equidigital number, since it uses as much as digits as its factorization.

22691661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7563890.

The product of its digits is 7776, while the sum is 33.

The square root of 22691661 is about 4763.5764925106. The cubic root of 22691661 is about 283.1101428788.

The spelling of 22691661 in words is "twenty-two million, six hundred ninety-one thousand, six hundred sixty-one".