19808874025 has 6 divisors (see below), whose sum is σ = 24563003822. Its totient is φ = 15847099200.

The previous prime is 19808874017. The next prime is 19808874077. The reversal of 19808874025 is 52047880891.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1144942569 + 18663931456 = 33837^2 + 136616^2 .

It is not a de Polignac number, because 19808874025 - 2³ = 19808874017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 396177456 + ... + 396177505.

Almost surely, 2^19808874025 is an apocalyptic number.

It is an amenable number.

19808874025 is a deficient number, since it is larger than the sum of its proper divisors (4754129797).

19808874025 is an equidigital number, since it uses as much as digits as its factorization.

19808874025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792354971 (or 792354966 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 52.

The spelling of 19808874025 in words is "nineteen billion, eight hundred eight million, eight hundred seventy-four thousand, twenty-five".