18949497600 has 864 divisors, whose sum is σ = 73579290624. Its totient is φ = 4248780800.

The previous prime is 18949497599. The next prime is 18949497649. The reversal of 18949497600 is 679494981.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 228307159 + ... + 228307241.

It is an arithmetic number, because the mean of its divisors is an integer number (85161216).

Almost surely, 2^18949497600 is an apocalyptic number.

18949497600 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 18949497600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36789645312).

18949497600 is an abundant number, since it is smaller than the sum of its proper divisors (54629793024).

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

18949497600 is a wasteful number, since it uses less digits than its factorization.

18949497600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 57.

The spelling of 18949497600 in words is "eighteen billion, nine hundred forty-nine million, four hundred ninety-seven thousand, six hundred".