27123731717 has 2 divisors, whose sum is σ = 27123731718. Its totient is φ = 27123731716.

The previous prime is 27123731689. The next prime is 27123731731. The reversal of 27123731717 is 71713732172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26870094241 + 253637476 = 163921^2 + 15926^2 .

It is a cyclic number.

It is not a de Polignac number, because 27123731717 - 2⁶ = 27123731653 is a prime.

It is a super-3 number, since 3×27123731717³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27123731777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13561865858 + 13561865859.

It is an arithmetic number, because the mean of its divisors is an integer number (13561865859).

Almost surely, 2^27123731717 is an apocalyptic number.

It is an amenable number.

27123731717 is a deficient number, since it is larger than the sum of its proper divisors (1).

27123731717 is an equidigital number, since it uses as much as digits as its factorization.

27123731717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86436, while the sum is 41.

The spelling of 27123731717 in words is "twenty-seven billion, one hundred twenty-three million, seven hundred thirty-one thousand, seven hundred seventeen".