366140561 has 2 divisors, whose sum is σ = 366140562. Its totient is φ = 366140560.

The previous prime is 366140557. The next prime is 366140563. The reversal of 366140561 is 165041663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 291214225 + 74926336 = 17065^2 + 8656^2 .

It is a cyclic number.

It is not a de Polignac number, because 366140561 - 2² = 366140557 is a prime.

Together with 366140563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (366140563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 183070280 + 183070281.

It is an arithmetic number, because the mean of its divisors is an integer number (183070281).

Almost surely, 2^366140561 is an apocalyptic number.

It is an amenable number.

366140561 is a deficient number, since it is larger than the sum of its proper divisors (1).

366140561 is an equidigital number, since it uses as much as digits as its factorization.

366140561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 366140561 is about 19134.7997376508. The cubic root of 366140561 is about 715.4005684122.

The spelling of 366140561 in words is "three hundred sixty-six million, one hundred forty thousand, five hundred sixty-one".