203204604540561 has 16 divisors (see below), whose sum is σ = 291783856007616. Its totient is φ = 125047750815936.

The previous prime is 203204604540491. The next prime is 203204604540577. The reversal of 203204604540561 is 165045406402302.

It is a happy number.

It is not a de Polignac number, because 203204604540561 - 2³⁴ = 203187424671377 is a prime.

It is a super-2 number, since 2×203204604540561² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (203204604560561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21760110 + ... + 29663303.

It is an arithmetic number, because the mean of its divisors is an integer number (18236491000476).

Almost surely, 2^{203204604540561} is an apocalyptic number.

It is an amenable number.

203204604540561 is a deficient number, since it is larger than the sum of its proper divisors (88579251467055).

203204604540561 is a wasteful number, since it uses less digits than its factorization.

203204604540561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51524752.

The product of its (nonzero) digits is 691200, while the sum is 42.

The spelling of 203204604540561 in words is "two hundred three trillion, two hundred four billion, six hundred four million, five hundred forty thousand, five hundred sixty-one".