27431697617 has 2 divisors, whose sum is σ = 27431697618. Its totient is φ = 27431697616.

The previous prime is 27431697509. The next prime is 27431697619. The reversal of 27431697617 is 71679613472.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25998015121 + 1433682496 = 161239^2 + 37864^2 .

It is a cyclic number.

It is not a de Polignac number, because 27431697617 - 2⁸ = 27431697361 is a prime.

Together with 27431697619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27431697619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13715848808 + 13715848809.

It is an arithmetic number, because the mean of its divisors is an integer number (13715848809).

Almost surely, 2^27431697617 is an apocalyptic number.

It is an amenable number.

27431697617 is a deficient number, since it is larger than the sum of its proper divisors (1).

27431697617 is an equidigital number, since it uses as much as digits as its factorization.

27431697617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2667168, while the sum is 53.

The spelling of 27431697617 in words is "twenty-seven billion, four hundred thirty-one million, six hundred ninety-seven thousand, six hundred seventeen".