19998404337 has 4 divisors (see below), whose sum is σ = 26664539120. Its totient is φ = 13332269556.

The previous prime is 19998404323. The next prime is 19998404341. The reversal of 19998404337 is 73340489991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 19998404337 - 2¹⁸ = 19998142193 is a prime.

It is a super-2 number, since 2×19998404337² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19998404317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3333067387 + ... + 3333067392.

It is an arithmetic number, because the mean of its divisors is an integer number (6666134780).

Almost surely, 2^19998404337 is an apocalyptic number.

It is an amenable number.

19998404337 is a deficient number, since it is larger than the sum of its proper divisors (6666134783).

19998404337 is an equidigital number, since it uses as much as digits as its factorization.

19998404337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6666134782.

The product of its (nonzero) digits is 5878656, while the sum is 57.

The spelling of 19998404337 in words is "nineteen billion, nine hundred ninety-eight million, four hundred four thousand, three hundred thirty-seven".