166740917 has 4 divisors (see below), whose sum is σ = 190561056. Its totient is φ = 142920780.

The previous prime is 166740863. The next prime is 166740929. The reversal of 166740917 is 719047661.

166740917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 719047661 = 53 ⋅13566937.

It is a cyclic number.

It is not a de Polignac number, because 166740917 - 2⁶ = 166740853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166740617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11910059 + ... + 11910072.

It is an arithmetic number, because the mean of its divisors is an integer number (47640264).

Almost surely, 2^166740917 is an apocalyptic number.

It is an amenable number.

166740917 is a deficient number, since it is larger than the sum of its proper divisors (23820139).

166740917 is an equidigital number, since it uses as much as digits as its factorization.

166740917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23820138.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 166740917 is about 12912.8198701910. The cubic root of 166740917 is about 550.4029190825.

The spelling of 166740917 in words is "one hundred sixty-six million, seven hundred forty thousand, nine hundred seventeen".