18998263680 has 256 divisors, whose sum is σ = 66202928640. Its totient is φ = 4595834880.

The previous prime is 18998263663. The next prime is 18998263681. The reversal of 18998263680 is 8636289981.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18998263681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17381214 + ... + 17382306.

It is an arithmetic number, because the mean of its divisors is an integer number (258605190).

Almost surely, 2^18998263680 is an apocalyptic number.

18998263680 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 18998263680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33101464320).

18998263680 is an abundant number, since it is smaller than the sum of its proper divisors (47204664960).

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

18998263680 is a wasteful number, since it uses less digits than its factorization.

18998263680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949 (or 1937 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 60.

The spelling of 18998263680 in words is "eighteen billion, nine hundred ninety-eight million, two hundred sixty-three thousand, six hundred eighty".