18561025122 has 32 divisors (see below), whose sum is σ = 37339868160. Its totient is φ = 6150746880.

The previous prime is 18561025079. The next prime is 18561025129. The reversal of 18561025122 is 22152016581.

It is a super-2 number, since 2×18561025122² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18561025129) 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 15 ways as a sum of consecutive naturals, for example, 2256954 + ... + 2265162.

It is an arithmetic number, because the mean of its divisors is an integer number (1166870880).

Almost surely, 2^18561025122 is an apocalyptic number.

18561025122 is an abundant number, since it is smaller than the sum of its proper divisors (18778843038).

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

18561025122 is a wasteful number, since it uses less digits than its factorization.

18561025122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10378.

The product of its (nonzero) digits is 9600, while the sum is 33.

The spelling of 18561025122 in words is "eighteen billion, five hundred sixty-one million, twenty-five thousand, one hundred twenty-two".