18609213952 has 80 divisors (see below), whose sum is σ = 42555883392. Its totient is φ = 7963729920.

The previous prime is 18609213929. The next prime is 18609213971. The reversal of 18609213952 is 25931290681.

It is a super-3 number, since 3×18609213952³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2724013 + ... + 2730835.

Almost surely, 2^18609213952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18609213952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21277941696).

18609213952 is an abundant number, since it is smaller than the sum of its proper divisors (23946669440).

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

18609213952 is an frugal number, since it uses more digits than its factorization.

18609213952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7609 (or 7593 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 18609213952 in words is "eighteen billion, six hundred nine million, two hundred thirteen thousand, nine hundred fifty-two".