18512259225 has 24 divisors (see below), whose sum is σ = 32407345440. Its totient is φ = 9292427520.

The previous prime is 18512259221. The next prime is 18512259307. The reversal of 18512259225 is 52295221581.

It is not a de Polignac number, because 18512259225 - 2² = 18512259221 is a prime.

It is a super-2 number, since 2×18512259225² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18512259221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7258435 + ... + 7260984.

It is an arithmetic number, because the mean of its divisors is an integer number (1350306060).

Almost surely, 2^18512259225 is an apocalyptic number.

18512259225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18512259225 is a deficient number, since it is larger than the sum of its proper divisors (13895086215).

18512259225 is a wasteful number, since it uses less digits than its factorization.

18512259225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14519449 (or 14519444 counting only the distinct ones).

The product of its digits is 144000, while the sum is 42.

The spelling of 18512259225 in words is "eighteen billion, five hundred twelve million, two hundred fifty-nine thousand, two hundred twenty-five".