22518025 has 12 divisors (see below), whose sum is σ = 28573072. Its totient is φ = 17594640.

The previous prime is 22518017. The next prime is 22518049. The reversal of 22518025 is 52081522.

It is not a de Polignac number, because 22518025 - 2³ = 22518017 is a prime.

It is a super-2 number, since 2×22518025² = 1014122899801250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9399 + ... + 11548.

Almost surely, 2^22518025 is an apocalyptic number.

22518025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22518025 is a deficient number, since it is larger than the sum of its proper divisors (6055047).

22518025 is a wasteful number, since it uses less digits than its factorization.

22518025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21000 (or 20995 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 22518025 is about 4745.3161117043. The cubic root of 22518025 is about 282.3861759839.

Adding to 22518025 its reverse (52081522), we get a palindrome (74599547).

The spelling of 22518025 in words is "twenty-two million, five hundred eighteen thousand, twenty-five".