4405505251991 has 2 divisors, whose sum is σ = 4405505251992. Its totient is φ = 4405505251990.

The previous prime is 4405505251967. The next prime is 4405505252017. The reversal of 4405505251991 is 1991525055044.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4405505251991 - 2¹⁰ = 4405505250967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4405505251951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2202752625995 + 2202752625996.

It is an arithmetic number, because the mean of its divisors is an integer number (2202752625996).

Almost surely, 2^{4405505251991} is an apocalyptic number.

4405505251991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4405505251991 is an equidigital number, since it uses as much as digits as its factorization.

4405505251991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620000, while the sum is 50.

The spelling of 4405505251991 in words is "four trillion, four hundred five billion, five hundred five million, two hundred fifty-one thousand, nine hundred ninety-one".