18864857625121 has 4 divisors (see below), whose sum is σ = 18894196440112. Its totient is φ = 18835518810132.

The previous prime is 18864857625073. The next prime is 18864857625143. The reversal of 18864857625121 is 12152675846881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18864857625121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18864857625221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14669406531 + ... + 14669407816.

It is an arithmetic number, because the mean of its divisors is an integer number (4723549110028).

Almost surely, 2^{18864857625121} is an apocalyptic number.

It is an amenable number.

18864857625121 is a deficient number, since it is larger than the sum of its proper divisors (29338814991).

18864857625121 is an equidigital number, since it uses as much as digits as its factorization.

18864857625121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29338814990.

The product of its digits is 51609600, while the sum is 64.

The spelling of 18864857625121 in words is "eighteen trillion, eight hundred sixty-four billion, eight hundred fifty-seven million, six hundred twenty-five thousand, one hundred twenty-one".