203612266161 has 20 divisors (see below), whose sum is σ = 304183609972. Its totient is φ = 135731658528.

The previous prime is 203612266157. The next prime is 203612266199. The reversal of 203612266161 is 161662216302.

203612266161 is a `hidden beast` number, since 2 + 0 + 3 + 6 + 12 + 26 + 616 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 173076800625 + 30535465536 = 416025^2 + 174744^2 .

It is not a de Polignac number, because 203612266161 - 2² = 203612266157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203612266861) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1132335 + ... + 1299771.

Almost surely, 2^203612266161 is an apocalyptic number.

It is an amenable number.

203612266161 is a deficient number, since it is larger than the sum of its proper divisors (100571343811).

203612266161 is a wasteful number, since it uses less digits than its factorization.

203612266161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182462 (or 182453 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 203612266161 in words is "two hundred three billion, six hundred twelve million, two hundred sixty-six thousand, one hundred sixty-one".