205772106643 has 2 divisors, whose sum is σ = 205772106644. Its totient is φ = 205772106642.

The previous prime is 205772106593. The next prime is 205772106731. The reversal of 205772106643 is 346601277502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205772106643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205772106643.

It is not a weakly prime, because it can be changed into another prime (205772103643) 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, 102886053321 + 102886053322.

It is an arithmetic number, because the mean of its divisors is an integer number (102886053322).

Almost surely, 2^205772106643 is an apocalyptic number.

205772106643 is a deficient number, since it is larger than the sum of its proper divisors (1).

205772106643 is an equidigital number, since it uses as much as digits as its factorization.

205772106643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 205772106643 in words is "two hundred five billion, seven hundred seventy-two million, one hundred six thousand, six hundred forty-three".