27657566479 has 2 divisors, whose sum is σ = 27657566480. Its totient is φ = 27657566478.

The previous prime is 27657566477. The next prime is 27657566537. The reversal of 27657566479 is 97466575672.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27657566479 - 2¹ = 27657566477 is a prime.

Together with 27657566477, 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 27657566479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27657566477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13828783239 + 13828783240.

It is an arithmetic number, because the mean of its divisors is an integer number (13828783240).

Almost surely, 2^27657566479 is an apocalyptic number.

27657566479 is a deficient number, since it is larger than the sum of its proper divisors (1).

27657566479 is an equidigital number, since it uses as much as digits as its factorization.

27657566479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 133358400, while the sum is 64.

The spelling of 27657566479 in words is "twenty-seven billion, six hundred fifty-seven million, five hundred sixty-six thousand, four hundred seventy-nine".