19978250027 has 2 divisors, whose sum is σ = 19978250028. Its totient is φ = 19978250026.

The previous prime is 19978250021. The next prime is 19978250029. The reversal of 19978250027 is 72005287991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19978250027 - 2²⁸ = 19709814571 is a prime.

Together with 19978250029, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19978250021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9989125013 + 9989125014.

It is an arithmetic number, because the mean of its divisors is an integer number (9989125014).

Almost surely, 2^19978250027 is an apocalyptic number.

19978250027 is a deficient number, since it is larger than the sum of its proper divisors (1).

19978250027 is an equidigital number, since it uses as much as digits as its factorization.

19978250027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 50.

The spelling of 19978250027 in words is "nineteen billion, nine hundred seventy-eight million, two hundred fifty thousand, twenty-seven".