55663838891 has 2 divisors, whose sum is σ = 55663838892. Its totient is φ = 55663838890.

The previous prime is 55663838833. The next prime is 55663838897. The reversal of 55663838891 is 19883836655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55663838891 - 2¹⁸ = 55663576747 is a prime.

It is not a weakly prime, because it can be changed into another prime (55663838897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27831919445 + 27831919446.

It is an arithmetic number, because the mean of its divisors is an integer number (27831919446).

Almost surely, 2^55663838891 is an apocalyptic number.

55663838891 is a deficient number, since it is larger than the sum of its proper divisors (1).

55663838891 is an equidigital number, since it uses as much as digits as its factorization.

55663838891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37324800, while the sum is 62.

The spelling of 55663838891 in words is "fifty-five billion, six hundred sixty-three million, eight hundred thirty-eight thousand, eight hundred ninety-one".