19996668198 has 48 divisors (see below), whose sum is σ = 46945232880. Its totient is φ = 6115061952.

The previous prime is 19996668187. The next prime is 19996668221. The reversal of 19996668198 is 89186669991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 223993 + ... + 300276.

It is an arithmetic number, because the mean of its divisors is an integer number (978025685).

Almost surely, 2^19996668198 is an apocalyptic number.

19996668198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19996668198 is an abundant number, since it is smaller than the sum of its proper divisors (26948564682).

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

19996668198 is a wasteful number, since it uses less digits than its factorization.

19996668198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524453 (or 524450 counting only the distinct ones).

The product of its digits is 90699264, while the sum is 72.

The spelling of 19996668198 in words is "nineteen billion, nine hundred ninety-six million, six hundred sixty-eight thousand, one hundred ninety-eight".