166870387 has 2 divisors, whose sum is σ = 166870388. Its totient is φ = 166870386.

The previous prime is 166870381. The next prime is 166870399. The reversal of 166870387 is 783078661.

It is a weak prime.

It is an emirp because it is prime and its reverse (783078661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166870387 - 2²³ = 158481779 is a prime.

It is not a weakly prime, because it can be changed into another prime (166870381) 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, 83435193 + 83435194.

It is an arithmetic number, because the mean of its divisors is an integer number (83435194).

Almost surely, 2^166870387 is an apocalyptic number.

166870387 is a deficient number, since it is larger than the sum of its proper divisors (1).

166870387 is an equidigital number, since it uses as much as digits as its factorization.

166870387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 166870387 is about 12917.8321323665. The cubic root of 166870387 is about 550.5453400934.

The spelling of 166870387 in words is "one hundred sixty-six million, eight hundred seventy thousand, three hundred eighty-seven".