18418961590121 has 32 divisors (see below), whose sum is σ = 19752665088000. Its totient is φ = 17125036044480.

The previous prime is 18418961590091. The next prime is 18418961590129. The reversal of 18418961590121 is 12109516981481.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18418961590121 - 2¹⁴ = 18418961573737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18418961590129) 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 31 ways as a sum of consecutive naturals, for example, 226378355 + ... + 226459703.

It is an arithmetic number, because the mean of its divisors is an integer number (617270784000).

Almost surely, 2^{18418961590121} is an apocalyptic number.

It is an amenable number.

18418961590121 is a deficient number, since it is larger than the sum of its proper divisors (1333703497879).

18418961590121 is a wasteful number, since it uses less digits than its factorization.

18418961590121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82509.

The product of its (nonzero) digits is 1244160, while the sum is 56.

The spelling of 18418961590121 in words is "eighteen trillion, four hundred eighteen billion, nine hundred sixty-one million, five hundred ninety thousand, one hundred twenty-one".