18961334272 has 102 divisors (see below), whose sum is σ = 39026652392. Its totient is φ = 9211478016.

The previous prime is 18961334269. The next prime is 18961334299. The reversal of 18961334272 is 27243316981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 184090573 + ... + 184090675.

Almost surely, 2^18961334272 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 18961334272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19513326196).

18961334272 is an abundant number, since it is smaller than the sum of its proper divisors (20065318120).

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

18961334272 is an frugal number, since it uses more digits than its factorization.

18961334272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 158 counting only the distinct ones).

The product of its digits is 435456, while the sum is 46.

The spelling of 18961334272 in words is "eighteen billion, nine hundred sixty-one million, three hundred thirty-four thousand, two hundred seventy-two".