18861927216 has 120 divisors (see below), whose sum is σ = 55888089600. Its totient is φ = 5467186560.

The previous prime is 18861927169. The next prime is 18861927269. The reversal of 18861927216 is 61272916881.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62985 + ... + 204183.

It is an arithmetic number, because the mean of its divisors is an integer number (465734080).

Almost surely, 2^18861927216 is an apocalyptic number.

18861927216 is a gapful number since it is divisible by the number (16) 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 18861927216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27944044800).

18861927216 is an abundant number, since it is smaller than the sum of its proper divisors (37026162384).

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

18861927216 is a wasteful number, since it uses less digits than its factorization.

18861927216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141255 (or 141238 counting only the distinct ones).

The product of its digits is 580608, while the sum is 51.

The spelling of 18861927216 in words is "eighteen billion, eight hundred sixty-one million, nine hundred twenty-seven thousand, two hundred sixteen".