19665504700 has 36 divisors (see below), whose sum is σ = 42685630792. Its totient is φ = 7864084800.

The previous prime is 19665504637. The next prime is 19665504757. The reversal of 19665504700 is 740556691.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 377647 + ... + 426553.

Almost surely, 2^19665504700 is an apocalyptic number.

19665504700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19665504700 is an abundant number, since it is smaller than the sum of its proper divisors (23020126092).

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

19665504700 is a wasteful number, since it uses less digits than its factorization.

19665504700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52942 (or 52935 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 19665504700 in words is "nineteen billion, six hundred sixty-five million, five hundred four thousand, seven hundred".