22123781525 has 12 divisors (see below), whose sum is σ = 27501914244. Its totient is φ = 17654880000.

The previous prime is 22123781509. The next prime is 22123781527. The reversal of 22123781525 is 52518732122.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 490666801 + 21633114724 = 22151^2 + 147082^2 .

It is not a de Polignac number, because 22123781525 - 2⁴ = 22123781509 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 (22123781527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1093406 + ... + 1113455.

It is an arithmetic number, because the mean of its divisors is an integer number (2291826187).

Almost surely, 2^22123781525 is an apocalyptic number.

22123781525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22123781525 is a deficient number, since it is larger than the sum of its proper divisors (5378132719).

22123781525 is a wasteful number, since it uses less digits than its factorization.

22123781525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207272 (or 2207267 counting only the distinct ones).

The product of its digits is 67200, while the sum is 38.

The spelling of 22123781525 in words is "twenty-two billion, one hundred twenty-three million, seven hundred eighty-one thousand, five hundred twenty-five".