18735943680 has 416 divisors, whose sum is σ = 68820126720. Its totient is φ = 4830658560.

The previous prime is 18735943673. The next prime is 18735943739. The reversal of 18735943680 is 8634953781.

18735943680 is a `hidden beast` number, since 1 + 87 + 3 + 59 + 436 + 80 = 666.

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 31 ways as a sum of consecutive naturals, for example, 17141214 + ... + 17142306.

Almost surely, 2^18735943680 is an apocalyptic number.

18735943680 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 18735943680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34410063360).

18735943680 is an abundant number, since it is smaller than the sum of its proper divisors (50084183040).

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

18735943680 is a wasteful number, since it uses less digits than its factorization.

18735943680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162 (or 1134 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 18735943680 in words is "eighteen billion, seven hundred thirty-five million, nine hundred forty-three thousand, six hundred eighty".