22504435661 has 4 divisors (see below), whose sum is σ = 23828226012. Its totient is φ = 21180645312.

The previous prime is 22504435651. The next prime is 22504435697. The reversal of 22504435661 is 16653440522.

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 13553383561 + 8951052100 = 116419^2 + 94610^2 .

It is a cyclic number.

It is not a de Polignac number, because 22504435661 - 2¹⁴ = 22504419277 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 (22504435621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661895150 + ... + 661895183.

It is an arithmetic number, because the mean of its divisors is an integer number (5957056503).

Almost surely, 2^22504435661 is an apocalyptic number.

It is an amenable number.

22504435661 is a deficient number, since it is larger than the sum of its proper divisors (1323790351).

22504435661 is a wasteful number, since it uses less digits than its factorization.

22504435661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323790350.

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 22504435661 in words is "twenty-two billion, five hundred four million, four hundred thirty-five thousand, six hundred sixty-one".