665888347 has 2 divisors, whose sum is σ = 665888348. Its totient is φ = 665888346.

The previous prime is 665888329. The next prime is 665888357. The reversal of 665888347 is 743888566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665888347 is a prime.

It is not a weakly prime, because it can be changed into another prime (665888357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332944173 + 332944174.

It is an arithmetic number, because the mean of its divisors is an integer number (332944174).

Almost surely, 2^665888347 is an apocalyptic number.

665888347 is a deficient number, since it is larger than the sum of its proper divisors (1).

665888347 is an equidigital number, since it uses as much as digits as its factorization.

665888347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7741440, while the sum is 55.

The square root of 665888347 is about 25804.8124775205. The cubic root of 665888347 is about 873.2403699226.

The spelling of 665888347 in words is "six hundred sixty-five million, eight hundred eighty-eight thousand, three hundred forty-seven".