166517389 has 2 divisors, whose sum is σ = 166517390. Its totient is φ = 166517388.

The previous prime is 166517383. The next prime is 166517419. The reversal of 166517389 is 983715661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142014889 + 24502500 = 11917^2 + 4950^2 .

It is a cyclic number.

It is not a de Polignac number, because 166517389 - 2⁹ = 166516877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166517383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83258694 + 83258695.

It is an arithmetic number, because the mean of its divisors is an integer number (83258695).

Almost surely, 2^166517389 is an apocalyptic number.

It is an amenable number.

166517389 is a deficient number, since it is larger than the sum of its proper divisors (1).

166517389 is an equidigital number, since it uses as much as digits as its factorization.

166517389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The square root of 166517389 is about 12904.1616930353. The cubic root of 166517389 is about 550.1568577399.

The spelling of 166517389 in words is "one hundred sixty-six million, five hundred seventeen thousand, three hundred eighty-nine".