170128442581 has 2 divisors, whose sum is σ = 170128442582. Its totient is φ = 170128442580.

The previous prime is 170128442557. The next prime is 170128442591. The reversal of 170128442581 is 185244821071.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159008740081 + 11119702500 = 398759^2 + 105450^2 .

It is a cyclic number.

It is not a de Polignac number, because 170128442581 - 2¹¹ = 170128440533 is a prime.

It is a super-2 number, since 2×170128442581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170128442591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85064221290 + 85064221291.

It is an arithmetic number, because the mean of its divisors is an integer number (85064221291).

Almost surely, 2^170128442581 is an apocalyptic number.

It is an amenable number.

170128442581 is a deficient number, since it is larger than the sum of its proper divisors (1).

170128442581 is an equidigital number, since it uses as much as digits as its factorization.

170128442581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 143360, while the sum is 43.

The spelling of 170128442581 in words is "one hundred seventy billion, one hundred twenty-eight million, four hundred forty-two thousand, five hundred eighty-one".