18865980000 has 1440 divisors, whose sum is σ = 86156421120. Its totient is φ = 3991680000.

The previous prime is 18865979999. The next prime is 18865980037. The reversal of 18865980000 is 8956881.

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 (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 608579985 + ... + 608580015.

It is an arithmetic number, because the mean of its divisors is an integer number (59830848).

Almost surely, 2^18865980000 is an apocalyptic number.

18865980000 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 18865980000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43078210560).

18865980000 is an abundant number, since it is smaller than the sum of its proper divisors (67290441120).

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

18865980000 is a wasteful number, since it uses less digits than its factorization.

18865980000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The spelling of 18865980000 in words is "eighteen billion, eight hundred sixty-five million, nine hundred eighty thousand".