22549658978 has 90 divisors (see below), whose sum is σ = 43594184193. Its totient is φ = 8740984560.

The previous prime is 22549658977. The next prime is 22549659017. The reversal of 22549658978 is 87985694522.

It can be written as a sum of positive squares in 2 ways, for example, as 14447318809 + 8102340169 = 120197^2 + 90013^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=106183.

It is not an unprimeable number, because it can be changed into a prime (22549658977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 114465176 + ... + 114465372.

Almost surely, 2^22549658978 is an apocalyptic number.

22549658978 is a deficient number, since it is larger than the sum of its proper divisors (21044525215).

22549658978 is an frugal number, since it uses more digits than its factorization.

22549658978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446 (or 217 counting only the distinct ones).

The product of its digits is 87091200, while the sum is 65.

The spelling of 22549658978 in words is "twenty-two billion, five hundred forty-nine million, six hundred fifty-eight thousand, nine hundred seventy-eight".