27706610821 has 2 divisors, whose sum is σ = 27706610822. Its totient is φ = 27706610820.

The previous prime is 27706610797. The next prime is 27706610857. The reversal of 27706610821 is 12801660772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27651033796 + 55577025 = 166286^2 + 7455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27706610821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27706610861) 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, 13853305410 + 13853305411.

It is an arithmetic number, because the mean of its divisors is an integer number (13853305411).

Almost surely, 2^27706610821 is an apocalyptic number.

It is an amenable number.

27706610821 is a deficient number, since it is larger than the sum of its proper divisors (1).

27706610821 is an equidigital number, since it uses as much as digits as its factorization.

27706610821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 40.

The spelling of 27706610821 in words is "twenty-seven billion, seven hundred six million, six hundred ten thousand, eight hundred twenty-one".