22403251561 has 4 divisors (see below), whose sum is σ = 22710145492. Its totient is φ = 22096357632.

The previous prime is 22403251553. The next prime is 22403251567. The reversal of 22403251561 is 16515230422.

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 15780384400 + 6622867161 = 125620^2 + 81381^2 .

It is a cyclic number.

It is not a de Polignac number, because 22403251561 - 2³ = 22403251553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22403251567) 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, 153446856 + ... + 153447001.

It is an arithmetic number, because the mean of its divisors is an integer number (5677536373).

Almost surely, 2^22403251561 is an apocalyptic number.

It is an amenable number.

22403251561 is a deficient number, since it is larger than the sum of its proper divisors (306893931).

22403251561 is an equidigital number, since it uses as much as digits as its factorization.

22403251561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306893930.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 22403251561 its reverse (16515230422), we get a palindrome (38918481983).

The spelling of 22403251561 in words is "twenty-two billion, four hundred three million, two hundred fifty-one thousand, five hundred sixty-one".