203243212556 has 6 divisors (see below), whose sum is σ = 355675621980. Its totient is φ = 101621606276.

The previous prime is 203243212541. The next prime is 203243212559. The reversal of 203243212556 is 655212342302.

It is not an unprimeable number, because it can be changed into a prime (203243212559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25405401566 + ... + 25405401573.

It is an arithmetic number, because the mean of its divisors is an integer number (59279270330).

Almost surely, 2^203243212556 is an apocalyptic number.

It is an amenable number.

203243212556 is a deficient number, since it is larger than the sum of its proper divisors (152432409424).

203243212556 is a wasteful number, since it uses less digits than its factorization.

203243212556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50810803143 (or 50810803141 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

Adding to 203243212556 its reverse (655212342302), we get a palindrome (858455554858).

The spelling of 203243212556 in words is "two hundred three billion, two hundred forty-three million, two hundred twelve thousand, five hundred fifty-six".