667161 has 24 divisors (see below), whose sum is σ = 1100736. Its totient is φ = 385440.

The previous prime is 667141. The next prime is 667171. The reversal of 667161 is 161766.

667161 = 144² + 145² + ... + 170².

It is not a de Polignac number, because 667161 - 2⁵ = 667129 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (667141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2131 + ... + 2423.

It is an arithmetic number, because the mean of its divisors is an integer number (45864).

2⁶⁶⁷¹⁶¹ is an apocalyptic number.

It is an amenable number.

667161 is a deficient number, since it is larger than the sum of its proper divisors (433575).

667161 is a wasteful number, since it uses less digits than its factorization.

667161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333 (or 330 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 667161 is about 816.7992409399. The cubic root of 667161 is about 87.3796331362.

It can be divided in two parts, 667 and 161, that added together give a palindrome (828).

The spelling of 667161 in words is "six hundred sixty-seven thousand, one hundred sixty-one".