206528851261 has 2 divisors, whose sum is σ = 206528851262. Its totient is φ = 206528851260.

The previous prime is 206528851169. The next prime is 206528851271. The reversal of 206528851261 is 162158825602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138149739225 + 68379112036 = 371685^2 + 261494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206528851261 is a prime.

It is a super-2 number, since 2×206528851261² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206528851271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103264425630 + 103264425631.

It is an arithmetic number, because the mean of its divisors is an integer number (103264425631).

Almost surely, 2^206528851261 is an apocalyptic number.

It is an amenable number.

206528851261 is a deficient number, since it is larger than the sum of its proper divisors (1).

206528851261 is an equidigital number, since it uses as much as digits as its factorization.

206528851261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 460800, while the sum is 46.

The spelling of 206528851261 in words is "two hundred six billion, five hundred twenty-eight million, eight hundred fifty-one thousand, two hundred sixty-one".