18811378481280 has 512 divisors, whose sum is σ = 74770248683520. Its totient is φ = 3908160307200.

The previous prime is 18811378481263. The next prime is 18811378481299. The reversal of 18811378481280 is 8218487311881.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1487411917 + ... + 1487424563.

It is an arithmetic number, because the mean of its divisors is an integer number (146035641960).

Almost surely, 2^{18811378481280} is an apocalyptic number.

18811378481280 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 18811378481280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37385124341760).

18811378481280 is an abundant number, since it is smaller than the sum of its proper divisors (55958870202240).

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

18811378481280 is a wasteful number, since it uses less digits than its factorization.

18811378481280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22748 (or 22736 counting only the distinct ones).

The product of its (nonzero) digits is 5505024, while the sum is 60.

The spelling of 18811378481280 in words is "eighteen trillion, eight hundred eleven billion, three hundred seventy-eight million, four hundred eighty-one thousand, two hundred eighty".