161814500121 has 8 divisors (see below), whose sum is σ = 223192414080. Its totient is φ = 104156459792.

The previous prime is 161814500059. The next prime is 161814500123. The reversal of 161814500121 is 121005418161.

161814500121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 161814500121 - 2¹⁰ = 161814499097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161814500123) 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 7 ways as a sum of consecutive naturals, for example, 929968305 + ... + 929968478.

It is an arithmetic number, because the mean of its divisors is an integer number (27899051760).

Almost surely, 2^161814500121 is an apocalyptic number.

It is an amenable number.

161814500121 is a deficient number, since it is larger than the sum of its proper divisors (61377913959).

161814500121 is a wasteful number, since it uses less digits than its factorization.

161814500121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859936815.

The product of its (nonzero) digits is 1920, while the sum is 30.

Adding to 161814500121 its reverse (121005418161), we get a palindrome (282819918282).

The spelling of 161814500121 in words is "one hundred sixty-one billion, eight hundred fourteen million, five hundred thousand, one hundred twenty-one".