206601603997 has 2 divisors, whose sum is σ = 206601603998. Its totient is φ = 206601603996.

The previous prime is 206601603977. The next prime is 206601604019. The reversal of 206601603997 is 799306106602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202346129241 + 4255474756 = 449829^2 + 65234^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206601603997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206601603997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206601603937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103300801998 + 103300801999.

It is an arithmetic number, because the mean of its divisors is an integer number (103300801999).

Almost surely, 2^206601603997 is an apocalyptic number.

It is an amenable number.

206601603997 is a deficient number, since it is larger than the sum of its proper divisors (1).

206601603997 is an equidigital number, since it uses as much as digits as its factorization.

206601603997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 49.

The spelling of 206601603997 in words is "two hundred six billion, six hundred one million, six hundred three thousand, nine hundred ninety-seven".