18199347840 has 256 divisors, whose sum is σ = 64928304000. Its totient is φ = 4817608704.

The previous prime is 18199347811. The next prime is 18199347869. The reversal of 18199347840 is 4874399181.

18199347840 is a `hidden beast` number, since 1 + 81 + 9 + 93 + 478 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (18199347811) and next prime (18199347869).

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2398132 + ... + 2405708.

Almost surely, 2^18199347840 is an apocalyptic number.

18199347840 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 18199347840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32464152000).

18199347840 is an abundant number, since it is smaller than the sum of its proper divisors (46728956160).

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

18199347840 is a wasteful number, since it uses less digits than its factorization.

18199347840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7744 (or 7726 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 18199347840 in words is "eighteen billion, one hundred ninety-nine million, three hundred forty-seven thousand, eight hundred forty".