205044146491 has 2 divisors, whose sum is σ = 205044146492. Its totient is φ = 205044146490.

The previous prime is 205044146479. The next prime is 205044146513. The reversal of 205044146491 is 194641440502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205044146491 - 2⁹ = 205044145979 is a prime.

It is a super-2 number, since 2×205044146491² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (205044146431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102522073245 + 102522073246.

It is an arithmetic number, because the mean of its divisors is an integer number (102522073246).

Almost surely, 2^205044146491 is an apocalyptic number.

205044146491 is a deficient number, since it is larger than the sum of its proper divisors (1).

205044146491 is an equidigital number, since it uses as much as digits as its factorization.

205044146491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 40.

Adding to 205044146491 its reverse (194641440502), we get a palindrome (399685586993).

The spelling of 205044146491 in words is "two hundred five billion, forty-four million, one hundred forty-six thousand, four hundred ninety-one".