5605505505991 has 2 divisors, whose sum is σ = 5605505505992. Its totient is φ = 5605505505990.

The previous prime is 5605505505979. The next prime is 5605505506087. The reversal of 5605505505991 is 1995055055065.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5605505505991 - 2²³ = 5605497117383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5605505505791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2802752752995 + 2802752752996.

It is an arithmetic number, because the mean of its divisors is an integer number (2802752752996).

Almost surely, 2^{5605505505991} is an apocalyptic number.

5605505505991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5605505505991 is an equidigital number, since it uses as much as digits as its factorization.

5605505505991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7593750, while the sum is 55.

The spelling of 5605505505991 in words is "five trillion, six hundred five billion, five hundred five million, five hundred five thousand, nine hundred ninety-one".