203505623117 has 2 divisors, whose sum is σ = 203505623118. Its totient is φ = 203505623116.

The previous prime is 203505623029. The next prime is 203505623171. The reversal of 203505623117 is 711326505302.

Together with next prime (203505623171) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193301794921 + 10203828196 = 439661^2 + 101014^2 .

It is a cyclic number.

It is not a de Polignac number, because 203505623117 - 2⁸ = 203505622861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203505623617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101752811558 + 101752811559.

It is an arithmetic number, because the mean of its divisors is an integer number (101752811559).

Almost surely, 2^203505623117 is an apocalyptic number.

It is an amenable number.

203505623117 is a deficient number, since it is larger than the sum of its proper divisors (1).

203505623117 is an equidigital number, since it uses as much as digits as its factorization.

203505623117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 35.

The spelling of 203505623117 in words is "two hundred three billion, five hundred five million, six hundred twenty-three thousand, one hundred seventeen".