27551218133 has 2 divisors, whose sum is σ = 27551218134. Its totient is φ = 27551218132.

The previous prime is 27551218117. The next prime is 27551218151. The reversal of 27551218133 is 33181215572.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22262728849 + 5288489284 = 149207^2 + 72722^2 .

It is a cyclic number.

It is not a de Polignac number, because 27551218133 - 2⁴ = 27551218117 is a prime.

It is a super-2 number, since 2×27551218133² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27551218193) 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, 13775609066 + 13775609067.

It is an arithmetic number, because the mean of its divisors is an integer number (13775609067).

Almost surely, 2^27551218133 is an apocalyptic number.

It is an amenable number.

27551218133 is a deficient number, since it is larger than the sum of its proper divisors (1).

27551218133 is an equidigital number, since it uses as much as digits as its factorization.

27551218133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 38.

The spelling of 27551218133 in words is "twenty-seven billion, five hundred fifty-one million, two hundred eighteen thousand, one hundred thirty-three".