366661 has 4 divisors (see below), whose sum is σ = 375232. Its totient is φ = 358092.

The previous prime is 366631. The next prime is 366677. The reversal of 366661 is 166663.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-366661 is a prime.

It is a Duffinian number.

366661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (366631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4221 + ... + 4306.

It is an arithmetic number, because the mean of its divisors is an integer number (93808).

2³⁶⁶⁶⁶¹ is an apocalyptic number.

It is an amenable number.

366661 is a deficient number, since it is larger than the sum of its proper divisors (8571).

366661 is an equidigital number, since it uses as much as digits as its factorization.

366661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8570.

The product of its digits is 3888, while the sum is 28.

The square root of 366661 is about 605.5253917054. The cubic root of 366661 is about 71.5739369159.

The spelling of 366661 in words is "three hundred sixty-six thousand, six hundred sixty-one".