666827 has 4 divisors (see below), whose sum is σ = 762096. Its totient is φ = 571560.

The previous prime is 666823. The next prime is 666829. The reversal of 666827 is 728666.

666827 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 728666 = 2 ⋅364333.

It is a cyclic number.

It is not a de Polignac number, because 666827 - 2² = 666823 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666821) 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, 47624 + ... + 47637.

It is an arithmetic number, because the mean of its divisors is an integer number (190524).

2⁶⁶⁶⁸²⁷ is an apocalyptic number.

666827 is a deficient number, since it is larger than the sum of its proper divisors (95269).

666827 is an equidigital number, since it uses as much as digits as its factorization.

666827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95268.

The product of its digits is 24192, while the sum is 35.

The square root of 666827 is about 816.5947587390. The cubic root of 666827 is about 87.3650491157.

The spelling of 666827 in words is "six hundred sixty-six thousand, eight hundred twenty-seven".