19868317250 has 16 divisors (see below), whose sum is σ = 37193490360. Its totient is φ = 7947326800.

The previous prime is 19868317243. The next prime is 19868317277. The reversal of 19868317250 is 5271386891.

It can be written as a sum of positive squares in 4 ways, for example, as 10684736689 + 9183580561 = 103367^2 + 95831^2 .

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a Curzon 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, 39736385 + ... + 39736884.

Almost surely, 2^19868317250 is an apocalyptic number.

19868317250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19868317250 is a deficient number, since it is larger than the sum of its proper divisors (17325173110).

19868317250 is an equidigital number, since it uses as much as digits as its factorization.

19868317250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79473286 (or 79473276 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 19868317250 in words is "nineteen billion, eight hundred sixty-eight million, three hundred seventeen thousand, two hundred fifty".