27991943783 has 2 divisors, whose sum is σ = 27991943784. Its totient is φ = 27991943782.

The previous prime is 27991943741. The next prime is 27991943801. The reversal of 27991943783 is 38734919972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27991943783 - 2⁶ = 27991943719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27991948783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13995971891 + 13995971892.

It is an arithmetic number, because the mean of its divisors is an integer number (13995971892).

Almost surely, 2^27991943783 is an apocalyptic number.

27991943783 is a deficient number, since it is larger than the sum of its proper divisors (1).

27991943783 is an equidigital number, since it uses as much as digits as its factorization.

27991943783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20575296, while the sum is 62.

The spelling of 27991943783 in words is "twenty-seven billion, nine hundred ninety-one million, nine hundred forty-three thousand, seven hundred eighty-three".