18915284916 has 480 divisors, whose sum is σ = 59569171200. Its totient is φ = 5173217280.

The previous prime is 18915284903. The next prime is 18915284953. The reversal of 18915284916 is 61948251981.

18915284916 is a `hidden beast` number, since 18 + 91 + 52 + 8 + 491 + 6 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 173534670 + ... + 173534778.

It is an arithmetic number, because the mean of its divisors is an integer number (124102440).

Almost surely, 2^18915284916 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 18915284916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29784585600).

18915284916 is an abundant number, since it is smaller than the sum of its proper divisors (40653886284).

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

18915284916 is a wasteful number, since it uses less digits than its factorization.

18915284916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 250 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 54.

The spelling of 18915284916 in words is "eighteen billion, nine hundred fifteen million, two hundred eighty-four thousand, nine hundred sixteen".