27997550081 has 2 divisors, whose sum is σ = 27997550082. Its totient is φ = 27997550080.

The previous prime is 27997550051. The next prime is 27997550083. The reversal of 27997550081 is 18005579972.

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., 27803895025 + 193655056 = 166745^2 + 13916^2 .

It is a cyclic number.

It is not a de Polignac number, because 27997550081 - 2¹⁸ = 27997287937 is a prime.

It is a super-2 number, since 2×27997550081² (a number of 22 digits) contains 22 as substring.

Together with 27997550083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27997550083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13998775040 + 13998775041.

It is an arithmetic number, because the mean of its divisors is an integer number (13998775041).

Almost surely, 2^27997550081 is an apocalyptic number.

It is an amenable number.

27997550081 is a deficient number, since it is larger than the sum of its proper divisors (1).

27997550081 is an equidigital number, since it uses as much as digits as its factorization.

27997550081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1587600, while the sum is 53.

The spelling of 27997550081 in words is "twenty-seven billion, nine hundred ninety-seven million, five hundred fifty thousand, eighty-one".