203426540689 has 2 divisors, whose sum is σ = 203426540690. Its totient is φ = 203426540688.

The previous prime is 203426540641. The next prime is 203426540743. The reversal of 203426540689 is 986045624302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160006400064 + 43420140625 = 400008^2 + 208375^2 .

It is a cyclic number.

It is not a de Polignac number, because 203426540689 - 2²³ = 203418152081 is a prime.

It is not a weakly prime, because it can be changed into another prime (203426540609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101713270344 + 101713270345.

It is an arithmetic number, because the mean of its divisors is an integer number (101713270345).

Almost surely, 2^203426540689 is an apocalyptic number.

It is an amenable number.

203426540689 is a deficient number, since it is larger than the sum of its proper divisors (1).

203426540689 is an equidigital number, since it uses as much as digits as its factorization.

203426540689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 49.

The spelling of 203426540689 in words is "two hundred three billion, four hundred twenty-six million, five hundred forty thousand, six hundred eighty-nine".