366616649221 has 2 divisors, whose sum is σ = 366616649222. Its totient is φ = 366616649220.

The previous prime is 366616649171. The next prime is 366616649237. The reversal of 366616649221 is 122946616663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 310651284321 + 55965364900 = 557361^2 + 236570^2 .

It is a cyclic number.

It is not a de Polignac number, because 366616649221 - 2³¹ = 364469165573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (366616649281) 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 as a sum of consecutive naturals, namely, 183308324610 + 183308324611.

It is an arithmetic number, because the mean of its divisors is an integer number (183308324611).

Almost surely, 2^366616649221 is an apocalyptic number.

It is an amenable number.

366616649221 is a deficient number, since it is larger than the sum of its proper divisors (1).

366616649221 is an equidigital number, since it uses as much as digits as its factorization.

366616649221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 52.

The spelling of 366616649221 in words is "three hundred sixty-six billion, six hundred sixteen million, six hundred forty-nine thousand, two hundred twenty-one".