18125412813 has 12 divisors (see below), whose sum is σ = 26675136540. Its totient is φ = 11855615616.

The previous prime is 18125412803. The next prime is 18125412829. The reversal of 18125412813 is 31821452181.

It is a happy number.

18125412813 is a `hidden beast` number, since 1 + 81 + 2 + 541 + 28 + 13 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4465179684 + 13660233129 = 66822^2 + 116877^2 .

It is not a de Polignac number, because 18125412813 - 2¹⁰ = 18125411789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18125412803) 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 11 ways as a sum of consecutive naturals, for example, 18998908 + ... + 18999861.

It is an arithmetic number, because the mean of its divisors is an integer number (2222928045).

Almost surely, 2^18125412813 is an apocalyptic number.

It is an amenable number.

18125412813 is a deficient number, since it is larger than the sum of its proper divisors (8549723727).

18125412813 is a wasteful number, since it uses less digits than its factorization.

18125412813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37998828 (or 37998825 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

Adding to 18125412813 its reverse (31821452181), we get a palindrome (49946864994).

The spelling of 18125412813 in words is "eighteen billion, one hundred twenty-five million, four hundred twelve thousand, eight hundred thirteen".