22636656146561 has 4 divisors (see below), whose sum is σ = 22636751505732. Its totient is φ = 22636560787392.

The previous prime is 22636656146537. The next prime is 22636656146633. The reversal of 22636656146561 is 16564165663622.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15958075499536 + 6678580647025 = 3994756^2 + 2584295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22636656146561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22636656146561.

It is not an unprimeable number, because it can be changed into a prime (22636652146561) 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, 47322620 + ... + 47798573.

It is an arithmetic number, because the mean of its divisors is an integer number (5659187876433).

Almost surely, 2^{22636656146561} is an apocalyptic number.

It is an amenable number.

22636656146561 is a deficient number, since it is larger than the sum of its proper divisors (95359171).

22636656146561 is an equidigital number, since it uses as much as digits as its factorization.

22636656146561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95359170.

The product of its digits is 55987200, while the sum is 59.

The spelling of 22636656146561 in words is "twenty-two trillion, six hundred thirty-six billion, six hundred fifty-six million, one hundred forty-six thousand, five hundred sixty-one".