27640613279 has 2 divisors, whose sum is σ = 27640613280. Its totient is φ = 27640613278.

The previous prime is 27640613243. The next prime is 27640613281. The reversal of 27640613279 is 97231604672.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27640613279 - 2²⁰ = 27639564703 is a prime.

It is a super-2 number, since 2×27640613279² (a number of 22 digits) contains 22 as substring.

Together with 27640613281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27640613219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13820306639 + 13820306640.

It is an arithmetic number, because the mean of its divisors is an integer number (13820306640).

Almost surely, 2^27640613279 is an apocalyptic number.

27640613279 is a deficient number, since it is larger than the sum of its proper divisors (1).

27640613279 is an equidigital number, since it uses as much as digits as its factorization.

27640613279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 47.

The spelling of 27640613279 in words is "twenty-seven billion, six hundred forty million, six hundred thirteen thousand, two hundred seventy-nine".