27566666623 has 2 divisors, whose sum is σ = 27566666624. Its totient is φ = 27566666622.

The previous prime is 27566666549. The next prime is 27566666627. The reversal of 27566666623 is 32666666572.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27566666623 is a prime.

It is a super-2 number, since 2×27566666623² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27566666627) 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, 13783333311 + 13783333312.

It is an arithmetic number, because the mean of its divisors is an integer number (13783333312).

Almost surely, 2^27566666623 is an apocalyptic number.

27566666623 is a deficient number, since it is larger than the sum of its proper divisors (1).

27566666623 is an equidigital number, since it uses as much as digits as its factorization.

27566666623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 55.

The spelling of 27566666623 in words is "twenty-seven billion, five hundred sixty-six million, six hundred sixty-six thousand, six hundred twenty-three".