18608612500 has 72 divisors (see below), whose sum is σ = 41263343352. Its totient is φ = 7341120000.

The previous prime is 18608612489. The next prime is 18608612509. The reversal of 18608612500 is 521680681.

It can be written as a sum of positive squares in 12 ways, for example, as 18451962244 + 156650256 = 135838^2 + 12516^2 .

It is a super-3 number, since 3×18608612500³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18608612500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18608612509) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 902304 + ... + 922696.

It is an arithmetic number, because the mean of its divisors is an integer number (573101991).

Almost surely, 2^18608612500 is an apocalyptic number.

18608612500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18608612500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20631671676).

18608612500 is an abundant number, since it is smaller than the sum of its proper divisors (22654730852).

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

18608612500 is an equidigital number, since it uses as much as digits as its factorization.

18608612500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20495 (or 20473 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The spelling of 18608612500 in words is "eighteen billion, six hundred eight million, six hundred twelve thousand, five hundred".