663677 has 4 divisors (see below), whose sum is σ = 758496. Its totient is φ = 568860.

The previous prime is 663661. The next prime is 663683. The reversal of 663677 is 776366.

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, and also an emirpimes, since its reverse is a distinct semiprime: 776366 = 2 ⋅388183.

It is a cyclic number.

It is not a de Polignac number, because 663677 - 2⁴ = 663661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663977) 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, 47399 + ... + 47412.

It is an arithmetic number, because the mean of its divisors is an integer number (189624).

2⁶⁶³⁶⁷⁷ is an apocalyptic number.

It is an amenable number.

663677 is a deficient number, since it is larger than the sum of its proper divisors (94819).

663677 is an equidigital number, since it uses as much as digits as its factorization.

663677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94818.

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

The square root of 663677 is about 814.6637343101. The cubic root of 663677 is about 87.2272650622.

The spelling of 663677 in words is "six hundred sixty-three thousand, six hundred seventy-seven".