6555444445591 has 2 divisors, whose sum is σ = 6555444445592. Its totient is φ = 6555444445590.

The previous prime is 6555444445573. The next prime is 6555444445633. The reversal of 6555444445591 is 1955444445556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6555444445591 - 2⁷ = 6555444445463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6555444445531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3277722222795 + 3277722222796.

It is an arithmetic number, because the mean of its divisors is an integer number (3277722222796).

Almost surely, 2^{6555444445591} is an apocalyptic number.

6555444445591 is a deficient number, since it is larger than the sum of its proper divisors (1).

6555444445591 is an equidigital number, since it uses as much as digits as its factorization.

6555444445591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800000, while the sum is 61.

The spelling of 6555444445591 in words is "six trillion, five hundred fifty-five billion, four hundred forty-four million, four hundred forty-five thousand, five hundred ninety-one".