203001666121 has 2 divisors, whose sum is σ = 203001666122. Its totient is φ = 203001666120.

The previous prime is 203001666107. The next prime is 203001666157. The reversal of 203001666121 is 121666100302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199969952400 + 3031713721 = 447180^2 + 55061^2 .

It is a cyclic number.

It is not a de Polignac number, because 203001666121 - 2⁵ = 203001666089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 203001666121.

It is not a weakly prime, because it can be changed into another prime (203001666221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101500833060 + 101500833061.

It is an arithmetic number, because the mean of its divisors is an integer number (101500833061).

Almost surely, 2^203001666121 is an apocalyptic number.

It is an amenable number.

203001666121 is a deficient number, since it is larger than the sum of its proper divisors (1).

203001666121 is an equidigital number, since it uses as much as digits as its factorization.

203001666121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

Adding to 203001666121 its reverse (121666100302), we get a palindrome (324667766423).

The spelling of 203001666121 in words is "two hundred three billion, one million, six hundred sixty-six thousand, one hundred twenty-one".