27967698557 has 2 divisors, whose sum is σ = 27967698558. Its totient is φ = 27967698556.

The previous prime is 27967698523. The next prime is 27967698559. The reversal of 27967698557 is 75589676972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26133632281 + 1834066276 = 161659^2 + 42826^2 .

It is a cyclic number.

It is not a de Polignac number, because 27967698557 - 2²⁰ = 27966649981 is a prime.

Together with 27967698559, 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 (27967698559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13983849278 + 13983849279.

It is an arithmetic number, because the mean of its divisors is an integer number (13983849279).

Almost surely, 2^27967698557 is an apocalyptic number.

It is an amenable number.

27967698557 is a deficient number, since it is larger than the sum of its proper divisors (1).

27967698557 is an equidigital number, since it uses as much as digits as its factorization.

27967698557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 400075200, while the sum is 71.

The spelling of 27967698557 in words is "twenty-seven billion, nine hundred sixty-seven million, six hundred ninety-eight thousand, five hundred fifty-seven".