661316711 has 8 divisors (see below), whose sum is σ = 763874064. Its totient is φ = 565832320.

The previous prime is 661316701. The next prime is 661316741. The reversal of 661316711 is 117613166.

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 661316711 - 2⁶ = 661316647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661316701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1768040 + ... + 1768413.

It is an arithmetic number, because the mean of its divisors is an integer number (95484258).

Almost surely, 2^661316711 is an apocalyptic number.

661316711 is a deficient number, since it is larger than the sum of its proper divisors (102557353).

661316711 is a wasteful number, since it uses less digits than its factorization.

661316711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3536481.

The product of its digits is 4536, while the sum is 32.

The square root of 661316711 is about 25716.0788418452. The cubic root of 661316711 is about 871.2373774285.

Adding to 661316711 its reverse (117613166), we get a palindrome (778929877).

The spelling of 661316711 in words is "six hundred sixty-one million, three hundred sixteen thousand, seven hundred eleven".