22621665665 has 8 divisors (see below), whose sum is σ = 27146822760. Its totient is φ = 18096783232.

The previous prime is 22621665641. The next prime is 22621665683. The reversal of 22621665665 is 56656612622.

It can be written as a sum of positive squares in 4 ways, for example, as 29170801 + 22592494864 = 5401^2 + 150308^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22621665665 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233117 + ... + 315573.

It is an arithmetic number, because the mean of its divisors is an integer number (3393352845).

Almost surely, 2^22621665665 is an apocalyptic number.

It is an amenable number.

22621665665 is a deficient number, since it is larger than the sum of its proper divisors (4525157095).

22621665665 is an equidigital number, since it uses as much as digits as its factorization.

22621665665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137331.

The product of its digits is 1555200, while the sum is 47.

The spelling of 22621665665 in words is "twenty-two billion, six hundred twenty-one million, six hundred sixty-five thousand, six hundred sixty-five".