203023117561 has 8 divisors (see below), whose sum is σ = 221483656800. Its totient is φ = 184563227040.

The previous prime is 203023117543. The next prime is 203023117567. The reversal of 203023117561 is 165711320302.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 203023117561 - 2¹⁵ = 203023084793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203023117567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 684330 + ... + 935068.

It is an arithmetic number, because the mean of its divisors is an integer number (27685457100).

Almost surely, 2^203023117561 is an apocalyptic number.

It is an amenable number.

203023117561 is a deficient number, since it is larger than the sum of its proper divisors (18460539239).

203023117561 is a wasteful number, since it uses less digits than its factorization.

203023117561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324359.

The product of its (nonzero) digits is 7560, while the sum is 31.

Adding to 203023117561 its reverse (165711320302), we get a palindrome (368734437863).

The spelling of 203023117561 in words is "two hundred three billion, twenty-three million, one hundred seventeen thousand, five hundred sixty-one".