206143642417 has 2 divisors, whose sum is σ = 206143642418. Its totient is φ = 206143642416.

The previous prime is 206143642363. The next prime is 206143642423. The reversal of 206143642417 is 714246341602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199459598881 + 6684043536 = 446609^2 + 81756^2 .

It is a cyclic number.

It is not a de Polignac number, because 206143642417 - 2¹⁵ = 206143609649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206143642417.

It is not a weakly prime, because it can be changed into another prime (206143642457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103071821208 + 103071821209.

It is an arithmetic number, because the mean of its divisors is an integer number (103071821209).

Almost surely, 2^206143642417 is an apocalyptic number.

It is an amenable number.

206143642417 is a deficient number, since it is larger than the sum of its proper divisors (1).

206143642417 is an equidigital number, since it uses as much as digits as its factorization.

206143642417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 40.

The spelling of 206143642417 in words is "two hundred six billion, one hundred forty-three million, six hundred forty-two thousand, four hundred seventeen".