19718966000 has 40 divisors (see below), whose sum is σ = 47680464624. Its totient is φ = 7887585600.

The previous prime is 19718965997. The next prime is 19718966011. The reversal of 19718966000 is 66981791.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4927742 + ... + 4931741.

Almost surely, 2^19718966000 is an apocalyptic number.

19718966000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19718966000 is an abundant number, since it is smaller than the sum of its proper divisors (27961498624).

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

19718966000 is an equidigital number, since it uses as much as digits as its factorization.

19718966000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9859506 (or 9859490 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 47.

The spelling of 19718966000 in words is "nineteen billion, seven hundred eighteen million, nine hundred sixty-six thousand".