166738 has 24 divisors (see below), whose sum is σ = 301644. Its totient is φ = 68640.

The previous prime is 166723. The next prime is 166739. The reversal of 166738 is 837661.

It can be written as a sum of positive squares in 2 ways, for example, as 165649 + 1089 = 407^2 + 33^2 .

It is not an unprimeable number, because it can be changed into a prime (166739) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3120 + ... + 3172.

2¹⁶⁶⁷³⁸ is an apocalyptic number.

166738 is a deficient number, since it is larger than the sum of its proper divisors (134906).

166738 is a wasteful number, since it uses less digits than its factorization.

166738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 79 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 166738 is about 408.3356462520. The cubic root of 166738 is about 55.0399709443.

The spelling of 166738 in words is "one hundred sixty-six thousand, seven hundred thirty-eight".