19390200257 has 2 divisors, whose sum is σ = 19390200258. Its totient is φ = 19390200256.

The previous prime is 19390200241. The next prime is 19390200259. The reversal of 19390200257 is 75200209391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18164570176 + 1225630081 = 134776^2 + 35009^2 .

It is a cyclic number.

It is not a de Polignac number, because 19390200257 - 2⁴ = 19390200241 is a prime.

Together with 19390200259, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19390200257.

It is not a weakly prime, because it can be changed into another prime (19390200259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9695100128 + 9695100129.

It is an arithmetic number, because the mean of its divisors is an integer number (9695100129).

Almost surely, 2^19390200257 is an apocalyptic number.

It is an amenable number.

19390200257 is a deficient number, since it is larger than the sum of its proper divisors (1).

19390200257 is an equidigital number, since it uses as much as digits as its factorization.

19390200257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 38.

The spelling of 19390200257 in words is "nineteen billion, three hundred ninety million, two hundred thousand, two hundred fifty-seven".