27721992653 has 2 divisors, whose sum is σ = 27721992654. Its totient is φ = 27721992652.

The previous prime is 27721992643. The next prime is 27721992659. The reversal of 27721992653 is 35629912772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14761764004 + 12960228649 = 121498^2 + 113843^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27721992653 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 27721992595 and 27721992604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27721992659) 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, 13860996326 + 13860996327.

It is an arithmetic number, because the mean of its divisors is an integer number (13860996327).

Almost surely, 2^27721992653 is an apocalyptic number.

It is an amenable number.

27721992653 is a deficient number, since it is larger than the sum of its proper divisors (1).

27721992653 is an equidigital number, since it uses as much as digits as its factorization.

27721992653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2857680, while the sum is 53.

The spelling of 27721992653 in words is "twenty-seven billion, seven hundred twenty-one million, nine hundred ninety-two thousand, six hundred fifty-three".