205054640501 has 2 divisors, whose sum is σ = 205054640502. Its totient is φ = 205054640500.

The previous prime is 205054640491. The next prime is 205054640503. The reversal of 205054640501 is 105046450502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202996203601 + 2058436900 = 450551^2 + 45370^2 .

It is a cyclic number.

It is not a de Polignac number, because 205054640501 - 2¹⁰ = 205054639477 is a prime.

It is a Sophie Germain prime.

Together with 205054640503, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205054640503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102527320250 + 102527320251.

It is an arithmetic number, because the mean of its divisors is an integer number (102527320251).

Almost surely, 2^205054640501 is an apocalyptic number.

It is an amenable number.

205054640501 is a deficient number, since it is larger than the sum of its proper divisors (1).

205054640501 is an equidigital number, since it uses as much as digits as its factorization.

205054640501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24000, while the sum is 32.

The spelling of 205054640501 in words is "two hundred five billion, fifty-four million, six hundred forty thousand, five hundred one".