27166542827861 has 2 divisors, whose sum is σ = 27166542827862. Its totient is φ = 27166542827860.

The previous prime is 27166542827821. The next prime is 27166542827933. The reversal of 27166542827861 is 16872824566172.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25551063697636 + 1615479130225 = 5054806^2 + 1271015^2 .

It is a cyclic number.

It is not a de Polignac number, because 27166542827861 - 2²² = 27166538633557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27166542827821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13583271413930 + 13583271413931.

It is an arithmetic number, because the mean of its divisors is an integer number (13583271413931).

Almost surely, 2^{27166542827861} is an apocalyptic number.

It is an amenable number.

27166542827861 is a deficient number, since it is larger than the sum of its proper divisors (1).

27166542827861 is an equidigital number, since it uses as much as digits as its factorization.

27166542827861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108380160, while the sum is 65.

The spelling of 27166542827861 in words is "twenty-seven trillion, one hundred sixty-six billion, five hundred forty-two million, eight hundred twenty-seven thousand, eight hundred sixty-one".