27966823517 has 2 divisors, whose sum is σ = 27966823518. Its totient is φ = 27966823516.

The previous prime is 27966823429. The next prime is 27966823529. The reversal of 27966823517 is 71532866972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25987374436 + 1979449081 = 161206^2 + 44491^2 .

It is a cyclic number.

It is not a de Polignac number, because 27966823517 - 2¹⁰ = 27966822493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27966823217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13983411758 + 13983411759.

It is an arithmetic number, because the mean of its divisors is an integer number (13983411759).

Almost surely, 2^27966823517 is an apocalyptic number.

It is an amenable number.

27966823517 is a deficient number, since it is larger than the sum of its proper divisors (1).

27966823517 is an equidigital number, since it uses as much as digits as its factorization.

27966823517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 56.

The spelling of 27966823517 in words is "twenty-seven billion, nine hundred sixty-six million, eight hundred twenty-three thousand, five hundred seventeen".