665747 has 2 divisors, whose sum is σ = 665748. Its totient is φ = 665746.

The previous prime is 665723. The next prime is 665761. The reversal of 665747 is 747566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665747 - 2¹⁸ = 403603 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (665047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332873 + 332874.

It is an arithmetic number, because the mean of its divisors is an integer number (332874).

2⁶⁶⁵⁷⁴⁷ is an apocalyptic number.

665747 is a deficient number, since it is larger than the sum of its proper divisors (1).

665747 is an equidigital number, since it uses as much as digits as its factorization.

665747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 35.

The square root of 665747 is about 815.9332080508. The cubic root of 665747 is about 87.3178578462.

The spelling of 665747 in words is "six hundred sixty-five thousand, seven hundred forty-seven".