205206765396851 has 2 divisors, whose sum is σ = 205206765396852. Its totient is φ = 205206765396850.

The previous prime is 205206765396839. The next prime is 205206765396883. The reversal of 205206765396851 is 158693567602502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205206765396851 is a prime.

It is not a weakly prime, because it can be changed into another prime (205206765396751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102603382698425 + 102603382698426.

It is an arithmetic number, because the mean of its divisors is an integer number (102603382698426).

Almost surely, 2^{205206765396851} is an apocalyptic number.

205206765396851 is a deficient number, since it is larger than the sum of its proper divisors (1).

205206765396851 is an equidigital number, since it uses as much as digits as its factorization.

205206765396851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296000, while the sum is 65.

The spelling of 205206765396851 in words is "two hundred five trillion, two hundred six billion, seven hundred sixty-five million, three hundred ninety-six thousand, eight hundred fifty-one".