661394341 has 2 divisors, whose sum is σ = 661394342. Its totient is φ = 661394340.

The previous prime is 661394339. The next prime is 661394429. The reversal of 661394341 is 143493166.

661394341 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 347076900 + 314317441 = 18630^2 + 17729^2 .

It is a cyclic number.

It is not a de Polignac number, because 661394341 - 2¹ = 661394339 is a prime.

Together with 661394339, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661394341.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661394441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330697170 + 330697171.

It is an arithmetic number, because the mean of its divisors is an integer number (330697171).

Almost surely, 2^661394341 is an apocalyptic number.

It is an amenable number.

661394341 is a deficient number, since it is larger than the sum of its proper divisors (1).

661394341 is an equidigital number, since it uses as much as digits as its factorization.

661394341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 37.

The square root of 661394341 is about 25717.5881645227. The cubic root of 661394341 is about 871.2714667487.

The spelling of 661394341 in words is "six hundred sixty-one million, three hundred ninety-four thousand, three hundred forty-one".