665334947 has 2 divisors, whose sum is σ = 665334948. Its totient is φ = 665334946.

The previous prime is 665334937. The next prime is 665334949. The reversal of 665334947 is 749433566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665334947 - 2¹² = 665330851 is a prime.

Together with 665334949, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (665334949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332667473 + 332667474.

It is an arithmetic number, because the mean of its divisors is an integer number (332667474).

Almost surely, 2^665334947 is an apocalyptic number.

665334947 is a deficient number, since it is larger than the sum of its proper divisors (1).

665334947 is an equidigital number, since it uses as much as digits as its factorization.

665334947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 47.

The square root of 665334947 is about 25794.0874426679. The cubic root of 665334947 is about 872.9983948445.

The spelling of 665334947 in words is "six hundred sixty-five million, three hundred thirty-four thousand, nine hundred forty-seven".