170661199 has 2 divisors, whose sum is σ = 170661200. Its totient is φ = 170661198.

The previous prime is 170661157. The next prime is 170661221. The reversal of 170661199 is 991166071.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 170661199 - 2¹⁷ = 170530127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170661299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85330599 + 85330600.

It is an arithmetic number, because the mean of its divisors is an integer number (85330600).

Almost surely, 2^170661199 is an apocalyptic number.

170661199 is a deficient number, since it is larger than the sum of its proper divisors (1).

170661199 is an equidigital number, since it uses as much as digits as its factorization.

170661199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 170661199 is about 13063.7360276454. The cubic root of 170661199 is about 554.6830958730.

The spelling of 170661199 in words is "one hundred seventy million, six hundred sixty-one thousand, one hundred ninety-nine".