166986533 has 16 divisors (see below), whose sum is σ = 194298624. Its totient is φ = 140555520.

The previous prime is 166986527. The next prime is 166986539. The reversal of 166986533 is 335689661.

It is an interprime number because it is at equal distance from previous prime (166986527) and next prime (166986539).

It is not a de Polignac number, because 166986533 - 2⁸ = 166986277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166986539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166991 + ... + 167987.

It is an arithmetic number, because the mean of its divisors is an integer number (12143664).

Almost surely, 2^166986533 is an apocalyptic number.

It is an amenable number.

166986533 is a deficient number, since it is larger than the sum of its proper divisors (27312091).

166986533 is an equidigital number, since it uses as much as digits as its factorization.

166986533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412.

The product of its digits is 699840, while the sum is 47.

The square root of 166986533 is about 12922.3269189415. The cubic root of 166986533 is about 550.6730416197.

The spelling of 166986533 in words is "one hundred sixty-six million, nine hundred eighty-six thousand, five hundred thirty-three".