840170397259 has 2 divisors, whose sum is σ = 840170397260. Its totient is φ = 840170397258.

The previous prime is 840170397163. The next prime is 840170397271. The reversal of 840170397259 is 952793071048.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840170397259 is a prime.

It is not a weakly prime, because it can be changed into another prime (840170307259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420085198629 + 420085198630.

It is an arithmetic number, because the mean of its divisors is an integer number (420085198630).

Almost surely, 2^840170397259 is an apocalyptic number.

840170397259 is a deficient number, since it is larger than the sum of its proper divisors (1).

840170397259 is an equidigital number, since it uses as much as digits as its factorization.

840170397259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 840170397259 in words is "eight hundred forty billion, one hundred seventy million, three hundred ninety-seven thousand, two hundred fifty-nine".