667261 has 16 divisors (see below), whose sum is σ = 835200. Its totient is φ = 520128.

The previous prime is 667243. The next prime is 667273. The reversal of 667261 is 162766.

It is not a de Polignac number, because 667261 - 2⁵ = 667229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667211) 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, 3771 + ... + 3943.

It is an arithmetic number, because the mean of its divisors is an integer number (52200).

2⁶⁶⁷²⁶¹ is an apocalyptic number.

It is an amenable number.

667261 is a deficient number, since it is larger than the sum of its proper divisors (167939).

667261 is a wasteful number, since it uses less digits than its factorization.

667261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228.

The product of its digits is 3024, while the sum is 28.

The square root of 667261 is about 816.8604531987. The cubic root of 667261 is about 87.3839986625.

The spelling of 667261 in words is "six hundred sixty-seven thousand, two hundred sixty-one".