27665551 has 2 divisors, whose sum is σ = 27665552. Its totient is φ = 27665550.

The previous prime is 27665549. The next prime is 27665557. The reversal of 27665551 is 15556672.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27665551 - 2¹ = 27665549 is a prime.

Together with 27665549, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 27665551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27665557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13832775 + 13832776.

It is an arithmetic number, because the mean of its divisors is an integer number (13832776).

Almost surely, 2^27665551 is an apocalyptic number.

27665551 is a deficient number, since it is larger than the sum of its proper divisors (1).

27665551 is an equidigital number, since it uses as much as digits as its factorization.

27665551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63000, while the sum is 37.

The square root of 27665551 is about 5259.8052245307. The cubic root of 27665551 is about 302.4450224519.

The spelling of 27665551 in words is "twenty-seven million, six hundred sixty-five thousand, five hundred fifty-one".