19981500306 has 32 divisors (see below), whose sum is σ = 42258295296. Its totient is φ = 6288432000.

The previous prime is 19981500269. The next prime is 19981500317. The reversal of 19981500306 is 60300518991.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1302465 + ... + 1317716.

It is an arithmetic number, because the mean of its divisors is an integer number (1320571728).

Almost surely, 2^19981500306 is an apocalyptic number.

19981500306 is an abundant number, since it is smaller than the sum of its proper divisors (22276794990).

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

19981500306 is a wasteful number, since it uses less digits than its factorization.

19981500306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2620258.

The product of its (nonzero) digits is 58320, while the sum is 42.

The spelling of 19981500306 in words is "nineteen billion, nine hundred eighty-one million, five hundred thousand, three hundred six".