661316741 has 2 divisors, whose sum is σ = 661316742. Its totient is φ = 661316740.

The previous prime is 661316701. The next prime is 661316771. The reversal of 661316741 is 147613166.

661316741 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390220516 + 271096225 = 19754^2 + 16465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661316741 is a prime.

It is a super-2 number, since 2×661316741² = 874679663853722162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661316701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330658370 + 330658371.

It is an arithmetic number, because the mean of its divisors is an integer number (330658371).

Almost surely, 2^661316741 is an apocalyptic number.

It is an amenable number.

661316741 is a deficient number, since it is larger than the sum of its proper divisors (1).

661316741 is an equidigital number, since it uses as much as digits as its factorization.

661316741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 661316741 is about 25716.0794251379. The cubic root of 661316741 is about 871.2373906028.

The spelling of 661316741 in words is "six hundred sixty-one million, three hundred sixteen thousand, seven hundred forty-one".