206611361549 has 2 divisors, whose sum is σ = 206611361550. Its totient is φ = 206611361548.

The previous prime is 206611361501. The next prime is 206611361659. The reversal of 206611361549 is 945163116602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167900799049 + 38710562500 = 409757^2 + 196750^2 .

It is a cyclic number.

It is not a de Polignac number, because 206611361549 - 2²⁸ = 206342926093 is a prime.

It is a super-2 number, since 2×206611361549² (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 (206611361149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103305680774 + 103305680775.

It is an arithmetic number, because the mean of its divisors is an integer number (103305680775).

Almost surely, 2^206611361549 is an apocalyptic number.

It is an amenable number.

206611361549 is a deficient number, since it is larger than the sum of its proper divisors (1).

206611361549 is an equidigital number, since it uses as much as digits as its factorization.

206611361549 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 206611361549 in words is "two hundred six billion, six hundred eleven million, three hundred sixty-one thousand, five hundred forty-nine".