19873002257 has 2 divisors, whose sum is σ = 19873002258. Its totient is φ = 19873002256.

The previous prime is 19873002241. The next prime is 19873002263. The reversal of 19873002257 is 75220037891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18374073601 + 1498928656 = 135551^2 + 38716^2 .

It is a cyclic number.

It is not a de Polignac number, because 19873002257 - 2⁴ = 19873002241 is a prime.

It is not a weakly prime, because it can be changed into another prime (19873002277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9936501128 + 9936501129.

It is an arithmetic number, because the mean of its divisors is an integer number (9936501129).

Almost surely, 2^19873002257 is an apocalyptic number.

It is an amenable number.

19873002257 is a deficient number, since it is larger than the sum of its proper divisors (1).

19873002257 is an equidigital number, since it uses as much as digits as its factorization.

19873002257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 44.

The spelling of 19873002257 in words is "nineteen billion, eight hundred seventy-three million, two thousand, two hundred fifty-seven".