166608749 has 4 divisors (see below), whose sum is σ = 170153664. Its totient is φ = 163063836.

The previous prime is 166608697. The next prime is 166608763. The reversal of 166608749 is 947806661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 947806661 = 17 ⋅55753333.

It is a cyclic number.

It is not a de Polignac number, because 166608749 - 2⁸ = 166608493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 3544867 = 166608749 / (1 + 6 + 6 + 6 + 0 + 8 + 7 + 4 + 9).

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 (166608149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1772387 + ... + 1772480.

It is an arithmetic number, because the mean of its divisors is an integer number (42538416).

Almost surely, 2^166608749 is an apocalyptic number.

It is an amenable number.

166608749 is a deficient number, since it is larger than the sum of its proper divisors (3544915).

166608749 is an equidigital number, since it uses as much as digits as its factorization.

166608749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3544914.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 166608749 is about 12907.7011508634. The cubic root of 166608749 is about 550.2574541230.

The spelling of 166608749 in words is "one hundred sixty-six million, six hundred eight thousand, seven hundred forty-nine".