170128442591 has 2 divisors, whose sum is σ = 170128442592. Its totient is φ = 170128442590.

The previous prime is 170128442581. The next prime is 170128442611. The reversal of 170128442591 is 195244821071.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (195244821071) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-170128442591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170128442581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85064221295 + 85064221296.

It is an arithmetic number, because the mean of its divisors is an integer number (85064221296).

Almost surely, 2^170128442591 is an apocalyptic number.

170128442591 is a deficient number, since it is larger than the sum of its proper divisors (1).

170128442591 is an equidigital number, since it uses as much as digits as its factorization.

170128442591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 170128442591 in words is "one hundred seventy billion, one hundred twenty-eight million, four hundred forty-two thousand, five hundred ninety-one".