206237689961 has 2 divisors, whose sum is σ = 206237689962. Its totient is φ = 206237689960.

The previous prime is 206237689943. The next prime is 206237689967. The reversal of 206237689961 is 169986732602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169739880025 + 36497809936 = 411995^2 + 191044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206237689961 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206237689961.

It is not a weakly prime, because it can be changed into another prime (206237689967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103118844980 + 103118844981.

It is an arithmetic number, because the mean of its divisors is an integer number (103118844981).

Almost surely, 2^206237689961 is an apocalyptic number.

It is an amenable number.

206237689961 is a deficient number, since it is larger than the sum of its proper divisors (1).

206237689961 is an equidigital number, since it uses as much as digits as its factorization.

206237689961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11757312, while the sum is 59.

The spelling of 206237689961 in words is "two hundred six billion, two hundred thirty-seven million, six hundred eighty-nine thousand, nine hundred sixty-one".