27726661693 has 2 divisors, whose sum is σ = 27726661694. Its totient is φ = 27726661692.

The previous prime is 27726661663. The next prime is 27726661709. The reversal of 27726661693 is 39616662772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15165183609 + 12561478084 = 123147^2 + 112078^2 .

It is a cyclic number.

It is not a de Polignac number, because 27726661693 - 2⁵ = 27726661661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27726661663) 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, 13863330846 + 13863330847.

It is an arithmetic number, because the mean of its divisors is an integer number (13863330847).

Almost surely, 2^27726661693 is an apocalyptic number.

It is an amenable number.

27726661693 is a deficient number, since it is larger than the sum of its proper divisors (1).

27726661693 is an equidigital number, since it uses as much as digits as its factorization.

27726661693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 55.

The spelling of 27726661693 in words is "twenty-seven billion, seven hundred twenty-six million, six hundred sixty-one thousand, six hundred ninety-three".