18501799680 has 1440 divisors, whose sum is σ = 85261486464. Its totient is φ = 3726508032.

The previous prime is 18501799637. The next prime is 18501799709. The reversal of 18501799680 is 8699710581.

18501799680 is a `hidden beast` number, since 1 + 8 + 501 + 79 + 9 + 68 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1440).

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, 349090534 + ... + 349090586.

Almost surely, 2^18501799680 is an apocalyptic number.

18501799680 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 18501799680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42630743232).

18501799680 is an abundant number, since it is smaller than the sum of its proper divisors (66759686784).

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

18501799680 is a wasteful number, since it uses less digits than its factorization.

18501799680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 54.

The spelling of 18501799680 in words is "eighteen billion, five hundred one million, seven hundred ninety-nine thousand, six hundred eighty".