203443042655 has 4 divisors (see below), whose sum is σ = 244131651192. Its totient is φ = 162754434120.

The previous prime is 203443042639. The next prime is 203443042661. The reversal of 203443042655 is 556240344302.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 203443042655 - 2⁴ = 203443042639 is a prime.

It is a super-3 number, since 3×203443042655³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20344304261 + ... + 20344304270.

It is an arithmetic number, because the mean of its divisors is an integer number (61032912798).

Almost surely, 2^203443042655 is an apocalyptic number.

203443042655 is a deficient number, since it is larger than the sum of its proper divisors (40688608537).

203443042655 is an equidigital number, since it uses as much as digits as its factorization.

203443042655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40688608536.

The product of its (nonzero) digits is 345600, while the sum is 38.

Adding to 203443042655 its reverse (556240344302), we get a palindrome (759683386957).

The spelling of 203443042655 in words is "two hundred three billion, four hundred forty-three million, forty-two thousand, six hundred fifty-five".