22445399561 has 16 divisors (see below), whose sum is σ = 25469384640. Its totient is φ = 19608920640.

The previous prime is 22445399549. The next prime is 22445399567. The reversal of 22445399561 is 16599354422.

It is a cyclic number.

It is not a de Polignac number, because 22445399561 - 2³⁰ = 21371657737 is a prime.

It is a super-2 number, since 2×22445399561² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22445399567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207686 + ... + 296688.

It is an arithmetic number, because the mean of its divisors is an integer number (1591836540).

Almost surely, 2^22445399561 is an apocalyptic number.

It is an amenable number.

22445399561 is a deficient number, since it is larger than the sum of its proper divisors (3023985079).

22445399561 is a wasteful number, since it uses less digits than its factorization.

22445399561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90056.

The product of its digits is 2332800, while the sum is 50.

The spelling of 22445399561 in words is "twenty-two billion, four hundred forty-five million, three hundred ninety-nine thousand, five hundred sixty-one".