19857403427 has 2 divisors, whose sum is σ = 19857403428. Its totient is φ = 19857403426.

The previous prime is 19857403339. The next prime is 19857403471. The reversal of 19857403427 is 72430475891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19857403427 - 2²⁰ = 19856354851 is a prime.

It is not a weakly prime, because it can be changed into another prime (19857003427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9928701713 + 9928701714.

It is an arithmetic number, because the mean of its divisors is an integer number (9928701714).

Almost surely, 2^19857403427 is an apocalyptic number.

19857403427 is a deficient number, since it is larger than the sum of its proper divisors (1).

19857403427 is an equidigital number, since it uses as much as digits as its factorization.

19857403427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 19857403427 in words is "nineteen billion, eight hundred fifty-seven million, four hundred three thousand, four hundred twenty-seven".