27861754169 has 2 divisors, whose sum is σ = 27861754170. Its totient is φ = 27861754168.

The previous prime is 27861754133. The next prime is 27861754199. The reversal of 27861754169 is 96145716872.

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., 15929468944 + 11932285225 = 126212^2 + 109235^2 .

It is a cyclic number.

It is not a de Polignac number, because 27861754169 - 2¹² = 27861750073 is a prime.

It is a super-2 number, since 2×27861754169² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27861754199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13930877084 + 13930877085.

It is an arithmetic number, because the mean of its divisors is an integer number (13930877085).

Almost surely, 2^27861754169 is an apocalyptic number.

It is an amenable number.

27861754169 is a deficient number, since it is larger than the sum of its proper divisors (1).

27861754169 is an equidigital number, since it uses as much as digits as its factorization.

27861754169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 56.

The spelling of 27861754169 in words is "twenty-seven billion, eight hundred sixty-one million, seven hundred fifty-four thousand, one hundred sixty-nine".