19803457999 has 16 divisors (see below), whose sum is σ = 22267994112. Its totient is φ = 17474374368.

The previous prime is 19803457991. The next prime is 19803458021. The reversal of 19803457999 is 99975430891.

It is a cyclic number.

It is not a de Polignac number, because 19803457999 - 2³ = 19803457991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19803457999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19803457991) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 477324 + ... + 517150.

It is an arithmetic number, because the mean of its divisors is an integer number (1391749632).

Almost surely, 2^19803457999 is an apocalyptic number.

19803457999 is a deficient number, since it is larger than the sum of its proper divisors (2464536113).

19803457999 is a wasteful number, since it uses less digits than its factorization.

19803457999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41526.

The product of its (nonzero) digits is 22044960, while the sum is 64.

The spelling of 19803457999 in words is "nineteen billion, eight hundred three million, four hundred fifty-seven thousand, nine hundred ninety-nine".