666477 has 24 divisors (see below), whose sum is σ = 1123200. Its totient is φ = 372960.

The previous prime is 666467. The next prime is 666493. The reversal of 666477 is 774666.

It is not a de Polignac number, because 666477 - 2⁴ = 666461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4399 + ... + 4547.

It is an arithmetic number, because the mean of its divisors is an integer number (46800).

2⁶⁶⁶⁴⁷⁷ is an apocalyptic number.

It is an amenable number.

666477 is a deficient number, since it is larger than the sum of its proper divisors (456723).

666477 is a wasteful number, since it uses less digits than its factorization.

666477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 230 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 666477 is about 816.3804260270. The cubic root of 666477 is about 87.3497612331.

The spelling of 666477 in words is "six hundred sixty-six thousand, four hundred seventy-seven".