2005501421591 has 2 divisors, whose sum is σ = 2005501421592. Its totient is φ = 2005501421590.

The previous prime is 2005501421537. The next prime is 2005501421597. The reversal of 2005501421591 is 1951241055002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2005501421591 - 2⁶ = 2005501421527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2005501421597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1002750710795 + 1002750710796.

It is an arithmetic number, because the mean of its divisors is an integer number (1002750710796).

Almost surely, 2^{2005501421591} is an apocalyptic number.

2005501421591 is a deficient number, since it is larger than the sum of its proper divisors (1).

2005501421591 is an equidigital number, since it uses as much as digits as its factorization.

2005501421591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 35.

Adding to 2005501421591 its reverse (1951241055002), we get a palindrome (3956742476593).

The spelling of 2005501421591 in words is "two trillion, five billion, five hundred one million, four hundred twenty-one thousand, five hundred ninety-one".