203453405616 has 20 divisors (see below), whose sum is σ = 525587964632. Its totient is φ = 67817801856.

The previous prime is 203453405609. The next prime is 203453405621. The reversal of 203453405616 is 616504354302.

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, 2119306261 + ... + 2119306356.

Almost surely, 2^203453405616 is an apocalyptic number.

It is an amenable number.

203453405616 is an abundant number, since it is smaller than the sum of its proper divisors (322134559016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

203453405616 is a wasteful number, since it uses less digits than its factorization.

203453405616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4238612628 (or 4238612622 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 39.

Adding to 203453405616 its reverse (616504354302), we get a palindrome (819957759918).

The spelling of 203453405616 in words is "two hundred three billion, four hundred fifty-three million, four hundred five thousand, six hundred sixteen".