19641234786 has 64 divisors (see below), whose sum is σ = 40872826368. Its totient is φ = 6287516928.

The previous prime is 19641234779. The next prime is 19641234791. The reversal of 19641234786 is 68743214691.

It is a happy 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 31 ways as a sum of consecutive naturals, for example, 16887841 + ... + 16889003.

It is an arithmetic number, because the mean of its divisors is an integer number (638637912).

Almost surely, 2^19641234786 is an apocalyptic number.

19641234786 is an abundant number, since it is smaller than the sum of its proper divisors (21231591582).

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

19641234786 is a wasteful number, since it uses less digits than its factorization.

19641234786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2255.

The product of its digits is 1741824, while the sum is 51.

The spelling of 19641234786 in words is "nineteen billion, six hundred forty-one million, two hundred thirty-four thousand, seven hundred eighty-six".