27731660413 has 2 divisors, whose sum is σ = 27731660414. Its totient is φ = 27731660412.

The previous prime is 27731660399. The next prime is 27731660417. The reversal of 27731660413 is 31406613772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19022478084 + 8709182329 = 137922^2 + 93323^2 .

It is a cyclic number.

It is not a de Polignac number, because 27731660413 - 2⁵ = 27731660381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27731660417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13865830206 + 13865830207.

It is an arithmetic number, because the mean of its divisors is an integer number (13865830207).

Almost surely, 2^27731660413 is an apocalyptic number.

It is an amenable number.

27731660413 is a deficient number, since it is larger than the sum of its proper divisors (1).

27731660413 is an equidigital number, since it uses as much as digits as its factorization.

27731660413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 40.

The spelling of 27731660413 in words is "twenty-seven billion, seven hundred thirty-one million, six hundred sixty thousand, four hundred thirteen".