661223713 has 8 divisors (see below), whose sum is σ = 672931136. Its totient is φ = 649544400.

The previous prime is 661223701. The next prime is 661223723. The reversal of 661223713 is 317322166.

661223713 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661223713 - 2¹³ = 661215521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661223723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43618 + ... + 56788.

It is an arithmetic number, because the mean of its divisors is an integer number (84116392).

Almost surely, 2^661223713 is an apocalyptic number.

It is an amenable number.

661223713 is a deficient number, since it is larger than the sum of its proper divisors (11707423).

661223713 is a wasteful number, since it uses less digits than its factorization.

661223713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14055.

The product of its digits is 9072, while the sum is 31.

The square root of 661223713 is about 25714.2706099162. The cubic root of 661223713 is about 871.1965361137.

Adding to 661223713 its reverse (317322166), we get a palindrome (978545879).

The spelling of 661223713 in words is "six hundred sixty-one million, two hundred twenty-three thousand, seven hundred thirteen".