166196389 has 2 divisors, whose sum is σ = 166196390. Its totient is φ = 166196388.

The previous prime is 166196383. The next prime is 166196417. The reversal of 166196389 is 983691661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115928289 + 50268100 = 10767^2 + 7090^2 .

It is a cyclic number.

It is not a de Polignac number, because 166196389 - 2⁵ = 166196357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166196383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83098194 + 83098195.

It is an arithmetic number, because the mean of its divisors is an integer number (83098195).

Almost surely, 2^166196389 is an apocalyptic number.

It is an amenable number.

166196389 is a deficient number, since it is larger than the sum of its proper divisors (1).

166196389 is an equidigital number, since it uses as much as digits as its factorization.

166196389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 49.

The square root of 166196389 is about 12891.7178451904. The cubic root of 166196389 is about 549.8031129986.

The spelling of 166196389 in words is "one hundred sixty-six million, one hundred ninety-six thousand, three hundred eighty-nine".