18565472019840 has 256 divisors, whose sum is σ = 59576558469120. Its totient is φ = 4917486034944.

The previous prime is 18565472019803. The next prime is 18565472019869. The reversal of 18565472019840 is 4891027456581.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 229551249 + ... + 229632111.

It is an arithmetic number, because the mean of its divisors is an integer number (232720931520).

Almost surely, 2^{18565472019840} is an apocalyptic number.

18565472019840 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 18565472019840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29788279234560).

18565472019840 is an abundant number, since it is smaller than the sum of its proper divisors (41011086449280).

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

18565472019840 is a wasteful number, since it uses less digits than its factorization.

18565472019840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81689 (or 81677 counting only the distinct ones).

The product of its (nonzero) digits is 19353600, while the sum is 60.

The spelling of 18565472019840 in words is "eighteen trillion, five hundred sixty-five billion, four hundred seventy-two million, nineteen thousand, eight hundred forty".