661316713 has 4 divisors (see below), whose sum is σ = 662274448. Its totient is φ = 660358980.

The previous prime is 661316701. The next prime is 661316741. The reversal of 661316713 is 317613166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661316713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661316213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477831 + ... + 479212.

It is an arithmetic number, because the mean of its divisors is an integer number (165568612).

Almost surely, 2^661316713 is an apocalyptic number.

It is an amenable number.

661316713 is a deficient number, since it is larger than the sum of its proper divisors (957735).

661316713 is an equidigital number, since it uses as much as digits as its factorization.

661316713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957734.

The product of its digits is 13608, while the sum is 34.

The square root of 661316713 is about 25716.0788807314. The cubic root of 661316713 is about 871.2373783068.

Adding to 661316713 its reverse (317613166), we get a palindrome (978929879).

The spelling of 661316713 in words is "six hundred sixty-one million, three hundred sixteen thousand, seven hundred thirteen".