6555623807591 has 2 divisors, whose sum is σ = 6555623807592. Its totient is φ = 6555623807590.

The previous prime is 6555623807503. The next prime is 6555623807609. The reversal of 6555623807591 is 1957083265556.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6555623807591 - 2¹⁴ = 6555623791207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6555623800591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3277811903795 + 3277811903796.

It is an arithmetic number, because the mean of its divisors is an integer number (3277811903796).

Almost surely, 2^{6555623807591} is an apocalyptic number.

6555623807591 is a deficient number, since it is larger than the sum of its proper divisors (1).

6555623807591 is an equidigital number, since it uses as much as digits as its factorization.

6555623807591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040000, while the sum is 62.

The spelling of 6555623807591 in words is "six trillion, five hundred fifty-five billion, six hundred twenty-three million, eight hundred seven thousand, five hundred ninety-one".