203644315242539 has 2 divisors, whose sum is σ = 203644315242540. Its totient is φ = 203644315242538.

The previous prime is 203644315242527. The next prime is 203644315242607. The reversal of 203644315242539 is 935242513446302.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203644315242539 is a prime.

It is not a weakly prime, because it can be changed into another prime (203644315242139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101822157621269 + 101822157621270.

It is an arithmetic number, because the mean of its divisors is an integer number (101822157621270).

Almost surely, 2^{203644315242539} is an apocalyptic number.

203644315242539 is a deficient number, since it is larger than the sum of its proper divisors (1).

203644315242539 is an equidigital number, since it uses as much as digits as its factorization.

203644315242539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18662400, while the sum is 53.

The spelling of 203644315242539 in words is "two hundred three trillion, six hundred forty-four billion, three hundred fifteen million, two hundred forty-two thousand, five hundred thirty-nine".