27183817561 has 2 divisors, whose sum is σ = 27183817562. Its totient is φ = 27183817560.

The previous prime is 27183817537. The next prime is 27183817709. The reversal of 27183817561 is 16571838172.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15140072025 + 12043745536 = 123045^2 + 109744^2 .

It is a cyclic number.

It is not a de Polignac number, because 27183817561 - 2¹¹ = 27183815513 is a prime.

It is not a weakly prime, because it can be changed into another prime (27183814561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13591908780 + 13591908781.

It is an arithmetic number, because the mean of its divisors is an integer number (13591908781).

Almost surely, 2^27183817561 is an apocalyptic number.

It is an amenable number.

27183817561 is a deficient number, since it is larger than the sum of its proper divisors (1).

27183817561 is an equidigital number, since it uses as much as digits as its factorization.

27183817561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 49.

The spelling of 27183817561 in words is "twenty-seven billion, one hundred eighty-three million, eight hundred seventeen thousand, five hundred sixty-one".