19397016194 has 4 divisors (see below), whose sum is σ = 29095524294. Its totient is φ = 9698508096.

The previous prime is 19397016187. The next prime is 19397016203. The reversal of 19397016194 is 49161079391.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49161079391 = 168743 ⋅291337.

It can be written as a sum of positive squares in only one way, i.e., 10264729225 + 9132286969 = 101315^2 + 95563^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4849254047 + ... + 4849254050.

Almost surely, 2^19397016194 is an apocalyptic number.

19397016194 is a deficient number, since it is larger than the sum of its proper divisors (9698508100).

19397016194 is an equidigital number, since it uses as much as digits as its factorization.

19397016194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9698508099.

The product of its (nonzero) digits is 367416, while the sum is 50.

The spelling of 19397016194 in words is "nineteen billion, three hundred ninety-seven million, sixteen thousand, one hundred ninety-four".