19969915194 has 48 divisors (see below), whose sum is σ = 43586971584. Its totient is φ = 6607656000.

The previous prime is 19969915183. The next prime is 19969915253. The reversal of 19969915194 is 49151996991.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6720129 + ... + 6723099.

It is an arithmetic number, because the mean of its divisors is an integer number (908061908).

Almost surely, 2^19969915194 is an apocalyptic number.

19969915194 is an abundant number, since it is smaller than the sum of its proper divisors (23617056390).

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

19969915194 is a wasteful number, since it uses less digits than its factorization.

19969915194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5603 (or 5600 counting only the distinct ones).

The product of its digits is 7085880, while the sum is 63.

The spelling of 19969915194 in words is "nineteen billion, nine hundred sixty-nine million, nine hundred fifteen thousand, one hundred ninety-four".