203506555253 has 12 divisors (see below), whose sum is σ = 211074397380. Its totient is φ = 196189661952.

The previous prime is 203506555223. The next prime is 203506555303. The reversal of 203506555253 is 352555605302.

It can be written as a sum of positive squares in 6 ways, for example, as 84607102129 + 118899453124 = 290873^2 + 344818^2 .

It is not a de Polignac number, because 203506555253 - 2²⁶ = 203439446389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 203506555253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203506555223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 532676 + ... + 831117.

It is an arithmetic number, because the mean of its divisors is an integer number (17589533115).

Almost surely, 2^203506555253 is an apocalyptic number.

It is an amenable number.

203506555253 is a deficient number, since it is larger than the sum of its proper divisors (7567842127).

203506555253 is a wasteful number, since it uses less digits than its factorization.

203506555253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363976 (or 1363939 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 41.

The spelling of 203506555253 in words is "two hundred three billion, five hundred six million, five hundred fifty-five thousand, two hundred fifty-three".