203390522128561 has 2 divisors, whose sum is σ = 203390522128562. Its totient is φ = 203390522128560.

The previous prime is 203390522128559. The next prime is 203390522128597. The reversal of 203390522128561 is 165821225093302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168364768047025 + 35025754081536 = 12975545^2 + 5918256^2 .

It is a cyclic number.

It is not a de Polignac number, because 203390522128561 - 2¹ = 203390522128559 is a prime.

Together with 203390522128559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (203390522128061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101695261064280 + 101695261064281.

It is an arithmetic number, because the mean of its divisors is an integer number (101695261064281).

Almost surely, 2^{203390522128561} is an apocalyptic number.

It is an amenable number.

203390522128561 is a deficient number, since it is larger than the sum of its proper divisors (1).

203390522128561 is an equidigital number, since it uses as much as digits as its factorization.

203390522128561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 203390522128561 in words is "two hundred three trillion, three hundred ninety billion, five hundred twenty-two million, one hundred twenty-eight thousand, five hundred sixty-one".