166681153 has 8 divisors (see below), whose sum is σ = 167600520. Its totient is φ = 165765120.

The previous prime is 166681147. The next prime is 166681159. The reversal of 166681153 is 351186661.

It is an interprime number because it is at equal distance from previous prime (166681147) and next prime (166681159).

It can be written as a sum of positive squares in 4 ways, for example, as 60652944 + 106028209 = 7788^2 + 10297^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166681153 - 2⁵ = 166681121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166681159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259713 + ... + 260353.

It is an arithmetic number, because the mean of its divisors is an integer number (20950065).

Almost surely, 2^166681153 is an apocalyptic number.

It is an amenable number.

166681153 is a deficient number, since it is larger than the sum of its proper divisors (919367).

166681153 is an equidigital number, since it uses as much as digits as its factorization.

166681153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667.

The product of its digits is 25920, while the sum is 37.

The square root of 166681153 is about 12910.5055284447. The cubic root of 166681153 is about 550.3371519601.

The spelling of 166681153 in words is "one hundred sixty-six million, six hundred eighty-one thousand, one hundred fifty-three".