666377 has 4 divisors (see below), whose sum is σ = 668820. Its totient is φ = 663936.

The previous prime is 666353. The next prime is 666403. The reversal of 666377 is 773666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59536 + 606841 = 244^2 + 779^2 .

It is a cyclic number.

It is not a de Polignac number, because 666377 - 2¹² = 662281 is a prime.

It is a super-2 number, since 2×666377² = 888116612258, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 666377.

It is not an unprimeable number, because it can be changed into a prime (666277) 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, 752 + ... + 1377.

It is an arithmetic number, because the mean of its divisors is an integer number (167205).

2⁶⁶⁶³⁷⁷ is an apocalyptic number.

It is an amenable number.

666377 is a deficient number, since it is larger than the sum of its proper divisors (2443).

666377 is a wasteful number, since it uses less digits than its factorization.

666377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442.

The product of its digits is 31752, while the sum is 35.

The square root of 666377 is about 816.3191777730. The cubic root of 666377 is about 87.3453922836.

The spelling of 666377 in words is "six hundred sixty-six thousand, three hundred seventy-seven".