166953959 has 4 divisors (see below), whose sum is σ = 166990104. Its totient is φ = 166917816.

The previous prime is 166953949. The next prime is 166953973. The reversal of 166953959 is 959359661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 959359661 = 13 ⋅73796897.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166953959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166953959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166953949) 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 in 3 ways as a sum of consecutive naturals, for example, 9917 + ... + 20790.

It is an arithmetic number, because the mean of its divisors is an integer number (41747526).

Almost surely, 2^166953959 is an apocalyptic number.

166953959 is a deficient number, since it is larger than the sum of its proper divisors (36145).

166953959 is an equidigital number, since it uses as much as digits as its factorization.

166953959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36144.

The product of its digits is 1968300, while the sum is 53.

The square root of 166953959 is about 12921.0664807515. The cubic root of 166953959 is about 550.6372327636.

The spelling of 166953959 in words is "one hundred sixty-six million, nine hundred fifty-three thousand, nine hundred fifty-nine".