205054640491 has 2 divisors, whose sum is σ = 205054640492. Its totient is φ = 205054640490.

The previous prime is 205054640431. The next prime is 205054640501. The reversal of 205054640491 is 194046450502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205054640491 - 2⁷ = 205054640363 is a prime.

It is not a weakly prime, because it can be changed into another prime (205054640431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102527320245 + 102527320246.

It is an arithmetic number, because the mean of its divisors is an integer number (102527320246).

Almost surely, 2^205054640491 is an apocalyptic number.

205054640491 is a deficient number, since it is larger than the sum of its proper divisors (1).

205054640491 is an equidigital number, since it uses as much as digits as its factorization.

205054640491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 205054640491 in words is "two hundred five billion, fifty-four million, six hundred forty thousand, four hundred ninety-one".