206138935061 has 2 divisors, whose sum is σ = 206138935062. Its totient is φ = 206138935060.

The previous prime is 206138935043. The next prime is 206138935091. The reversal of 206138935061 is 160539831602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190974244036 + 15164691025 = 437006^2 + 123145^2 .

It is a cyclic number.

It is not a de Polignac number, because 206138935061 - 2⁶ = 206138934997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206138935091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103069467530 + 103069467531.

It is an arithmetic number, because the mean of its divisors is an integer number (103069467531).

Almost surely, 2^206138935061 is an apocalyptic number.

It is an amenable number.

206138935061 is a deficient number, since it is larger than the sum of its proper divisors (1).

206138935061 is an equidigital number, since it uses as much as digits as its factorization.

206138935061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 206138935061 in words is "two hundred six billion, one hundred thirty-eight million, nine hundred thirty-five thousand, sixty-one".