19917898867 has 8 divisors (see below), whose sum is σ = 20480987376. Its totient is φ = 19356113952.

The previous prime is 19917898841. The next prime is 19917898883. The reversal of 19917898867 is 76889871991.

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 19917898867 - 2¹⁹ = 19917374579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19917898867.

It is not an unprimeable number, because it can be changed into a prime (19917898837) 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, 294868 + ... + 356065.

It is an arithmetic number, because the mean of its divisors is an integer number (2560123422).

Almost surely, 2^19917898867 is an apocalyptic number.

19917898867 is a deficient number, since it is larger than the sum of its proper divisors (563088509).

19917898867 is an equidigital number, since it uses as much as digits as its factorization.

19917898867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651797.

The product of its digits is 109734912, while the sum is 73.

The spelling of 19917898867 in words is "nineteen billion, nine hundred seventeen million, eight hundred ninety-eight thousand, eight hundred sixty-seven".