27315571639 has 2 divisors, whose sum is σ = 27315571640. Its totient is φ = 27315571638.

The previous prime is 27315571637. The next prime is 27315571667. The reversal of 27315571639 is 93617551372.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27315571639 - 2¹ = 27315571637 is a prime.

It is a super-2 number, since 2×27315571639² (a number of 22 digits) contains 22 as substring.

Together with 27315571637, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 27315571592 and 27315571601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27315571637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13657785819 + 13657785820.

It is an arithmetic number, because the mean of its divisors is an integer number (13657785820).

Almost surely, 2^27315571639 is an apocalyptic number.

27315571639 is a deficient number, since it is larger than the sum of its proper divisors (1).

27315571639 is an equidigital number, since it uses as much as digits as its factorization.

27315571639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1190700, while the sum is 49.

The spelling of 27315571639 in words is "twenty-seven billion, three hundred fifteen million, five hundred seventy-one thousand, six hundred thirty-nine".