27938532217 has 2 divisors, whose sum is σ = 27938532218. Its totient is φ = 27938532216.

The previous prime is 27938532199. The next prime is 27938532229. The reversal of 27938532217 is 71223583972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21072586896 + 6865945321 = 145164^2 + 82861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27938532217 is a prime.

It is not a weakly prime, because it can be changed into another prime (27938535217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13969266108 + 13969266109.

It is an arithmetic number, because the mean of its divisors is an integer number (13969266109).

Almost surely, 2^27938532217 is an apocalyptic number.

It is an amenable number.

27938532217 is a deficient number, since it is larger than the sum of its proper divisors (1).

27938532217 is an equidigital number, since it uses as much as digits as its factorization.

27938532217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 49.

The spelling of 27938532217 in words is "twenty-seven billion, nine hundred thirty-eight million, five hundred thirty-two thousand, two hundred seventeen".