166749 has 16 divisors (see below), whose sum is σ = 251904. Its totient is φ = 97200.

The previous prime is 166741. The next prime is 166781. The reversal of 166749 is 947661.

It is a happy number.

It is not a de Polignac number, because 166749 - 2³ = 166741 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166741) 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, 942 + ... + 1104.

It is an arithmetic number, because the mean of its divisors is an integer number (15744).

2¹⁶⁶⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

166749 is a deficient number, since it is larger than the sum of its proper divisors (85155).

166749 is a wasteful number, since it uses less digits than its factorization.

166749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208.

The product of its digits is 9072, while the sum is 33.

The square root of 166749 is about 408.3491153413. The cubic root of 166749 is about 55.0411812790.

The spelling of 166749 in words is "one hundred sixty-six thousand, seven hundred forty-nine".