206231365555121 has 2 divisors, whose sum is σ = 206231365555122. Its totient is φ = 206231365555120.

The previous prime is 206231365555087. The next prime is 206231365555183. The reversal of 206231365555121 is 121555563132602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164784358490896 + 41447007064225 = 12836836^2 + 6437935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206231365555121 is a prime.

It is a super-2 number, since 2×206231365555121² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (206231365558121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103115682777560 + 103115682777561.

It is an arithmetic number, because the mean of its divisors is an integer number (103115682777561).

Almost surely, 2^{206231365555121} is an apocalyptic number.

It is an amenable number.

206231365555121 is a deficient number, since it is larger than the sum of its proper divisors (1).

206231365555121 is an equidigital number, since it uses as much as digits as its factorization.

206231365555121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620000, while the sum is 47.

The spelling of 206231365555121 in words is "two hundred six trillion, two hundred thirty-one billion, three hundred sixty-five million, five hundred fifty-five thousand, one hundred twenty-one".