206623013032661 has 2 divisors, whose sum is σ = 206623013032662. Its totient is φ = 206623013032660.

The previous prime is 206623013032619. The next prime is 206623013032697. The reversal of 206623013032661 is 166230310326602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192881238172561 + 13741774860100 = 13888169^2 + 3706990^2 .

It is a cyclic number.

It is not a de Polignac number, because 206623013032661 - 2¹⁰ = 206623013031637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206623013052661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103311506516330 + 103311506516331.

It is an arithmetic number, because the mean of its divisors is an integer number (103311506516331).

Almost surely, 2^{206623013032661} is an apocalyptic number.

It is an amenable number.

206623013032661 is a deficient number, since it is larger than the sum of its proper divisors (1).

206623013032661 is an equidigital number, since it uses as much as digits as its factorization.

206623013032661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 41.

The spelling of 206623013032661 in words is "two hundred six trillion, six hundred twenty-three billion, thirteen million, thirty-two thousand, six hundred sixty-one".