166858387 has 2 divisors, whose sum is σ = 166858388. Its totient is φ = 166858386.

The previous prime is 166858381. The next prime is 166858403. The reversal of 166858387 is 783858661.

166858387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166858387 - 2³ = 166858379 is a prime.

It is not a weakly prime, because it can be changed into another prime (166858381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83429193 + 83429194.

It is an arithmetic number, because the mean of its divisors is an integer number (83429194).

Almost surely, 2^166858387 is an apocalyptic number.

166858387 is a deficient number, since it is larger than the sum of its proper divisors (1).

166858387 is an equidigital number, since it uses as much as digits as its factorization.

166858387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 52.

The square root of 166858387 is about 12917.3676497961. The cubic root of 166858387 is about 550.5321428198.

The spelling of 166858387 in words is "one hundred sixty-six million, eight hundred fifty-eight thousand, three hundred eighty-seven".