19990001999 has 8 divisors (see below), whose sum is σ = 21818208000. Its totient is φ = 18163618200.

The previous prime is 19990001989. The next prime is 19990002017. The reversal of 19990001999 is 99910009991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19990001999 - 2⁸ = 19990001743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19990001959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 432557 + ... + 476534.

It is an arithmetic number, because the mean of its divisors is an integer number (2727276000).

Almost surely, 2^19990001999 is an apocalyptic number.

19990001999 is a deficient number, since it is larger than the sum of its proper divisors (1828206001).

19990001999 is a wasteful number, since it uses less digits than its factorization.

19990001999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911101.

The product of its (nonzero) digits is 531441, while the sum is 56.

The spelling of 19990001999 in words is "nineteen billion, nine hundred ninety million, one thousand, nine hundred ninety-nine".