27556577565553 has 2 divisors, whose sum is σ = 27556577565554. Its totient is φ = 27556577565552.

The previous prime is 27556577565533. The next prime is 27556577565599. The reversal of 27556577565553 is 35556577565572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26428410694449 + 1128166871104 = 5140857^2 + 1062152^2 .

It is a cyclic number.

It is not a de Polignac number, because 27556577565553 - 2¹⁷ = 27556577434481 is a prime.

It is not a weakly prime, because it can be changed into another prime (27556577565533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13778288782776 + 13778288782777.

It is an arithmetic number, because the mean of its divisors is an integer number (13778288782777).

Almost surely, 2^{27556577565553} is an apocalyptic number.

It is an amenable number.

27556577565553 is a deficient number, since it is larger than the sum of its proper divisors (1).

27556577565553 is an equidigital number, since it uses as much as digits as its factorization.

27556577565553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5788125000, while the sum is 73.

The spelling of 27556577565553 in words is "twenty-seven trillion, five hundred fifty-six billion, five hundred seventy-seven million, five hundred sixty-five thousand, five hundred fifty-three".