27885805621 has 2 divisors, whose sum is σ = 27885805622. Its totient is φ = 27885805620.

The previous prime is 27885805609. The next prime is 27885805663. The reversal of 27885805621 is 12650858872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19944500625 + 7941304996 = 141225^2 + 89114^2 .

It is a cyclic number.

It is not a de Polignac number, because 27885805621 - 2¹⁵ = 27885772853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27885805121) 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, 13942902810 + 13942902811.

It is an arithmetic number, because the mean of its divisors is an integer number (13942902811).

Almost surely, 2^27885805621 is an apocalyptic number.

It is an amenable number.

27885805621 is a deficient number, since it is larger than the sum of its proper divisors (1).

27885805621 is an equidigital number, since it uses as much as digits as its factorization.

27885805621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2150400, while the sum is 52.

The spelling of 27885805621 in words is "twenty-seven billion, eight hundred eighty-five million, eight hundred five thousand, six hundred twenty-one".