167666 has 4 divisors (see below), whose sum is σ = 251502. Its totient is φ = 83832.

The previous prime is 167663. The next prime is 167677. The reversal of 167666 is 666761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666761 = 71 ⋅9391.

It can be written as a sum of positive squares in only one way, i.e., 143641 + 24025 = 379^2 + 155^2 .

It is a super-2 number, since 2×167666² = 56223775112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (167663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41915 + ... + 41918.

2¹⁶⁷⁶⁶⁶ is an apocalyptic number.

167666 is a deficient number, since it is larger than the sum of its proper divisors (83836).

167666 is an equidigital number, since it uses as much as digits as its factorization.

167666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83835.

The product of its digits is 9072, while the sum is 32.

The square root of 167666 is about 409.4703896499. The cubic root of 167666 is about 55.1418925747.

The spelling of 167666 in words is "one hundred sixty-seven thousand, six hundred sixty-six".