27666313956653 has 2 divisors, whose sum is σ = 27666313956654. Its totient is φ = 27666313956652.

The previous prime is 27666313956641. The next prime is 27666313956763. The reversal of 27666313956653 is 35665931366672.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13976217756484 + 13690096200169 = 3738478^2 + 3700013^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27666313956653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27666313956623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13833156978326 + 13833156978327.

It is an arithmetic number, because the mean of its divisors is an integer number (13833156978327).

Almost surely, 2^{27666313956653} is an apocalyptic number.

It is an amenable number.

27666313956653 is a deficient number, since it is larger than the sum of its proper divisors (1).

27666313956653 is an equidigital number, since it uses as much as digits as its factorization.

27666313956653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 661348800, while the sum is 68.

The spelling of 27666313956653 in words is "twenty-seven trillion, six hundred sixty-six billion, three hundred thirteen million, nine hundred fifty-six thousand, six hundred fifty-three".