18122530900 has 18 divisors (see below), whose sum is σ = 39325892270. Its totient is φ = 7249012320.

The previous prime is 18122530889. The next prime is 18122530903. The reversal of 18122530900 is 903522181.

It can be written as a sum of positive squares in 3 ways, for example, as 1673955396 + 16448575504 = 40914^2 + 128252^2 .

It is a super-2 number, since 2×18122530900² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18122530903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90612555 + ... + 90612754.

Almost surely, 2^18122530900 is an apocalyptic number.

18122530900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18122530900 is an abundant number, since it is smaller than the sum of its proper divisors (21203361370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18122530900 is a wasteful number, since it uses less digits than its factorization.

18122530900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181225323 (or 181225316 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 18122530900 in words is "eighteen billion, one hundred twenty-two million, five hundred thirty thousand, nine hundred".