665450347 has 2 divisors, whose sum is σ = 665450348. Its totient is φ = 665450346.

The previous prime is 665450311. The next prime is 665450369. The reversal of 665450347 is 743054566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665450347 - 2¹⁵ = 665417579 is a prime.

It is not a weakly prime, because it can be changed into another prime (665450147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332725173 + 332725174.

It is an arithmetic number, because the mean of its divisors is an integer number (332725174).

Almost surely, 2^665450347 is an apocalyptic number.

665450347 is a deficient number, since it is larger than the sum of its proper divisors (1).

665450347 is an equidigital number, since it uses as much as digits as its factorization.

665450347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 40.

The square root of 665450347 is about 25796.3242924258. The cubic root of 665450347 is about 873.0488647575.

The spelling of 665450347 in words is "six hundred sixty-five million, four hundred fifty thousand, three hundred forty-seven".