27909534973 has 2 divisors, whose sum is σ = 27909534974. Its totient is φ = 27909534972.

The previous prime is 27909534869. The next prime is 27909534997. The reversal of 27909534973 is 37943590972.

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., 16698325284 + 11211209689 = 129222^2 + 105883^2 .

It is a cyclic number.

It is not a de Polignac number, because 27909534973 - 2¹³ = 27909526781 is a prime.

It is a super-2 number, since 2×27909534973² (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 (27909534073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13954767486 + 13954767487.

It is an arithmetic number, because the mean of its divisors is an integer number (13954767487).

Almost surely, 2^27909534973 is an apocalyptic number.

It is an amenable number.

27909534973 is a deficient number, since it is larger than the sum of its proper divisors (1).

27909534973 is an equidigital number, since it uses as much as digits as its factorization.

27909534973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12859560, while the sum is 58.

The spelling of 27909534973 in words is "twenty-seven billion, nine hundred nine million, five hundred thirty-four thousand, nine hundred seventy-three".