19663894000 has 40 divisors (see below), whose sum is σ = 47547300528. Its totient is φ = 7865556800.

The previous prime is 19663893979. The next prime is 19663894013. The reversal of 19663894000 is 49836691.

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, 4913974 + ... + 4917973.

Almost surely, 2^19663894000 is an apocalyptic number.

19663894000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19663894000 is an abundant number, since it is smaller than the sum of its proper divisors (27883406528).

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

19663894000 is an equidigital number, since it uses as much as digits as its factorization.

19663894000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9831970 (or 9831954 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 19663894000 in words is "nineteen billion, six hundred sixty-three million, eight hundred ninety-four thousand".