19491059198 has 16 divisors (see below), whose sum is σ = 33337649520. Its totient is φ = 8466704256.

The previous prime is 19491059087. The next prime is 19491059209. The reversal of 19491059198 is 89195019491.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22048268 + ... + 22049151.

It is an arithmetic number, because the mean of its divisors is an integer number (2083603095).

Almost surely, 2^19491059198 is an apocalyptic number.

19491059198 is a deficient number, since it is larger than the sum of its proper divisors (13846590322).

19491059198 is a wasteful number, since it uses less digits than its factorization.

19491059198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44097451.

The product of its (nonzero) digits is 1049760, while the sum is 56.

The spelling of 19491059198 in words is "nineteen billion, four hundred ninety-one million, fifty-nine thousand, one hundred ninety-eight".