665223347 has 6 divisors (see below), whose sum is σ = 667018548. Its totient is φ = 663430884.

The previous prime is 665223343. The next prime is 665223359. The reversal of 665223347 is 743322566.

It is a happy number.

It is not a de Polignac number, because 665223347 - 2² = 665223343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665223347.

It is not an unprimeable number, because it can be changed into a prime (665223343) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 611438 + ... + 612524.

It is an arithmetic number, because the mean of its divisors is an integer number (111169758).

Almost surely, 2^665223347 is an apocalyptic number.

665223347 is a deficient number, since it is larger than the sum of its proper divisors (1795201).

665223347 is an frugal number, since it uses more digits than its factorization.

665223347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2737 (or 1650 counting only the distinct ones).

The product of its digits is 181440, while the sum is 38.

The square root of 665223347 is about 25791.9240654900. The cubic root of 665223347 is about 872.9495813012.

The spelling of 665223347 in words is "six hundred sixty-five million, two hundred twenty-three thousand, three hundred forty-seven".