18020615782400 has 816 divisors, whose sum is σ = 56422454231808. Its totient is φ = 5545918464000.

The previous prime is 18020615782357. The next prime is 18020615782417. The reversal of 18020615782400 is 428751602081.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10471013540 + ... + 10471015260.

Almost surely, 2^{18020615782400} is an apocalyptic number.

18020615782400 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 18020615782400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28211227115904).

18020615782400 is an abundant number, since it is smaller than the sum of its proper divisors (38401838449408).

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

18020615782400 is an equidigital number, since it uses as much as digits as its factorization.

18020615782400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864 (or 1829 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 18020615782400 in words is "eighteen trillion, twenty billion, six hundred fifteen million, seven hundred eighty-two thousand, four hundred".