661361411 has 2 divisors, whose sum is σ = 661361412. Its totient is φ = 661361410.

The previous prime is 661361359. The next prime is 661361431. The reversal of 661361411 is 114163166.

661361411 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 is a cyclic number.

It is not a de Polignac number, because 661361411 - 2¹⁸ = 661099267 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (661361431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330680705 + 330680706.

It is an arithmetic number, because the mean of its divisors is an integer number (330680706).

Almost surely, 2^661361411 is an apocalyptic number.

661361411 is a deficient number, since it is larger than the sum of its proper divisors (1).

661361411 is an equidigital number, since it uses as much as digits as its factorization.

661361411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 661361411 is about 25716.9479332210. The cubic root of 661361411 is about 871.2570066685.

The spelling of 661361411 in words is "six hundred sixty-one million, three hundred sixty-one thousand, four hundred eleven".