170662561 has 2 divisors, whose sum is σ = 170662562. Its totient is φ = 170662560.

The previous prime is 170662493. The next prime is 170662589. The reversal of 170662561 is 165266071.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105698961 + 64963600 = 10281^2 + 8060^2 .

It is a cyclic number.

It is not a de Polignac number, because 170662561 - 2⁷ = 170662433 is a prime.

It is not a weakly prime, because it can be changed into another prime (170602561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85331280 + 85331281.

It is an arithmetic number, because the mean of its divisors is an integer number (85331281).

Almost surely, 2^170662561 is an apocalyptic number.

It is an amenable number.

170662561 is a deficient number, since it is larger than the sum of its proper divisors (1).

170662561 is an equidigital number, since it uses as much as digits as its factorization.

170662561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 170662561 is about 13063.7881565800. The cubic root of 170662561 is about 554.6845714600.

The spelling of 170662561 in words is "one hundred seventy million, six hundred sixty-two thousand, five hundred sixty-one".