206346224101561 has 2 divisors, whose sum is σ = 206346224101562. Its totient is φ = 206346224101560.

The previous prime is 206346224101441. The next prime is 206346224101583. The reversal of 206346224101561 is 165101422643602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201721487831161 + 4624736270400 = 14202869^2 + 2150520^2 .

It is a cyclic number.

It is not a de Polignac number, because 206346224101561 - 2¹⁵ = 206346224068793 is a prime.

It is not a weakly prime, because it can be changed into another prime (206346224101861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103173112050780 + 103173112050781.

It is an arithmetic number, because the mean of its divisors is an integer number (103173112050781).

Almost surely, 2^{206346224101561} is an apocalyptic number.

It is an amenable number.

206346224101561 is a deficient number, since it is larger than the sum of its proper divisors (1).

206346224101561 is an equidigital number, since it uses as much as digits as its factorization.

206346224101561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 206346224101561 in words is "two hundred six trillion, three hundred forty-six billion, two hundred twenty-four million, one hundred one thousand, five hundred sixty-one".