203123161118191 has 4 divisors (see below), whose sum is σ = 203136196053952. Its totient is φ = 203110126182432.

The previous prime is 203123161118173. The next prime is 203123161118203. The reversal of 203123161118191 is 191811161321302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 203123161118191 - 2⁵ = 203123161118159 is a prime.

It is a super-2 number, since 2×203123161118191² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203123161118491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6517444506 + ... + 6517475671.

It is an arithmetic number, because the mean of its divisors is an integer number (50784049013488).

Almost surely, 2^{203123161118191} is an apocalyptic number.

203123161118191 is a deficient number, since it is larger than the sum of its proper divisors (13034935761).

203123161118191 is a wasteful number, since it uses less digits than its factorization.

203123161118191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13034935760.

The product of its (nonzero) digits is 15552, while the sum is 40.

The spelling of 203123161118191 in words is "two hundred three trillion, one hundred twenty-three billion, one hundred sixty-one million, one hundred eighteen thousand, one hundred ninety-one".