27983681477 has 2 divisors, whose sum is σ = 27983681478. Its totient is φ = 27983681476.

The previous prime is 27983681471. The next prime is 27983681567. The reversal of 27983681477 is 77418638972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16610312161 + 11373369316 = 128881^2 + 106646^2 .

It is a cyclic number.

It is not a de Polignac number, because 27983681477 - 2²⁰ = 27982632901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27983681471) 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, 13991840738 + 13991840739.

It is an arithmetic number, because the mean of its divisors is an integer number (13991840739).

Almost surely, 2^27983681477 is an apocalyptic number.

It is an amenable number.

27983681477 is a deficient number, since it is larger than the sum of its proper divisors (1).

27983681477 is an equidigital number, since it uses as much as digits as its factorization.

27983681477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28449792, while the sum is 62.

The spelling of 27983681477 in words is "twenty-seven billion, nine hundred eighty-three million, six hundred eighty-one thousand, four hundred seventy-seven".