55005004991 has 2 divisors, whose sum is σ = 55005004992. Its totient is φ = 55005004990.

The previous prime is 55005004981. The next prime is 55005005017. The reversal of 55005004991 is 19940050055.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55005004991 - 2¹⁸ = 55004742847 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55005004981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27502502495 + 27502502496.

It is an arithmetic number, because the mean of its divisors is an integer number (27502502496).

Almost surely, 2^55005004991 is an apocalyptic number.

55005004991 is a deficient number, since it is larger than the sum of its proper divisors (1).

55005004991 is an equidigital number, since it uses as much as digits as its factorization.

55005004991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40500, while the sum is 38.

The spelling of 55005004991 in words is "fifty-five billion, five million, four thousand, nine hundred ninety-one".