203555109778056 has 64 divisors (see below), whose sum is σ = 595190379480000. Its totient is φ = 64280560981248.

The previous prime is 203555109778051. The next prime is 203555109778081. The reversal of 203555109778056 is 650877901555302.

203555109778056 is a `hidden beast` number, since 2 + 0 + 3 + 5 + 551 + 0 + 9 + 7 + 78 + 0 + 5 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 203555109777984 and 203555109778002.

It is not an unprimeable number, because it can be changed into a prime (203555109778051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24799595041 + ... + 24799603248.

It is an arithmetic number, because the mean of its divisors is an integer number (9299849679375).

Almost surely, 2^{203555109778056} is an apocalyptic number.

It is an amenable number.

203555109778056 is an abundant number, since it is smaller than the sum of its proper divisors (391635269701944).

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

203555109778056 is a wasteful number, since it uses less digits than its factorization.

203555109778056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49599198323 (or 49599198313 counting only the distinct ones).

The product of its (nonzero) digits is 79380000, while the sum is 63.

The spelling of 203555109778056 in words is "two hundred three trillion, five hundred fifty-five billion, one hundred nine million, seven hundred seventy-eight thousand, fifty-six".