19218384780 has 96 divisors (see below), whose sum is σ = 62096047104. Its totient is φ = 4350115584.

The previous prime is 19218384671. The next prime is 19218384799. The reversal of 19218384780 is 8748381291.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 178867 + ... + 265386.

It is an arithmetic number, because the mean of its divisors is an integer number (646833824).

Almost surely, 2^19218384780 is an apocalyptic number.

19218384780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19218384780 is an abundant number, since it is smaller than the sum of its proper divisors (42877662324).

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

19218384780 is a wasteful number, since it uses less digits than its factorization.

19218384780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444375 (or 444373 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 51.

The spelling of 19218384780 in words is "nineteen billion, two hundred eighteen million, three hundred eighty-four thousand, seven hundred eighty".