27803900557 has 2 divisors, whose sum is σ = 27803900558. Its totient is φ = 27803900556.

The previous prime is 27803900533. The next prime is 27803900563. The reversal of 27803900557 is 75500930872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26302028041 + 1501872516 = 162179^2 + 38754^2 .

It is a cyclic number.

It is not a de Polignac number, because 27803900557 - 2⁷ = 27803900429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27803900587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13901950278 + 13901950279.

It is an arithmetic number, because the mean of its divisors is an integer number (13901950279).

Almost surely, 2^27803900557 is an apocalyptic number.

It is an amenable number.

27803900557 is a deficient number, since it is larger than the sum of its proper divisors (1).

27803900557 is an equidigital number, since it uses as much as digits as its factorization.

27803900557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 27803900557 in words is "twenty-seven billion, eight hundred three million, nine hundred thousand, five hundred fifty-seven".