55665561563 has 2 divisors, whose sum is σ = 55665561564. Its totient is φ = 55665561562.

The previous prime is 55665561541. The next prime is 55665561641. The reversal of 55665561563 is 36516556655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55665561563 - 2¹⁴ = 55665545179 is a prime.

It is not a weakly prime, because it can be changed into another prime (55665561533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27832780781 + 27832780782.

It is an arithmetic number, because the mean of its divisors is an integer number (27832780782).

Almost surely, 2^55665561563 is an apocalyptic number.

55665561563 is a deficient number, since it is larger than the sum of its proper divisors (1).

55665561563 is an equidigital number, since it uses as much as digits as its factorization.

55665561563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12150000, while the sum is 53.

The spelling of 55665561563 in words is "fifty-five billion, six hundred sixty-five million, five hundred sixty-one thousand, five hundred sixty-three".