27666671 has 2 divisors, whose sum is σ = 27666672. Its totient is φ = 27666670.

The previous prime is 27666649. The next prime is 27666721. The reversal of 27666671 is 17666672.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27666671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27666571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13833335 + 13833336.

It is an arithmetic number, because the mean of its divisors is an integer number (13833336).

Almost surely, 2^27666671 is an apocalyptic number.

27666671 is a deficient number, since it is larger than the sum of its proper divisors (1).

27666671 is an equidigital number, since it uses as much as digits as its factorization.

27666671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 41.

The square root of 27666671 is about 5259.9116912739. The cubic root of 27666671 is about 302.4491037473.

Subtracting from 27666671 its reverse (17666672), we obtain a palindrome (9999999).

The spelling of 27666671 in words is "twenty-seven million, six hundred sixty-six thousand, six hundred seventy-one".