18001146813 has 32 divisors (see below), whose sum is σ = 27388803456. Its totient is φ = 10418178048.

The previous prime is 18001146791. The next prime is 18001146833. The reversal of 18001146813 is 31864110081.

It is a happy number.

It is not a de Polignac number, because 18001146813 - 2⁶ = 18001146749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18001146833) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 940606 + ... + 959552.

It is an arithmetic number, because the mean of its divisors is an integer number (855900108).

Almost surely, 2^18001146813 is an apocalyptic number.

18001146813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18001146813 is a deficient number, since it is larger than the sum of its proper divisors (9387656643).

18001146813 is a wasteful number, since it uses less digits than its factorization.

18001146813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20413.

The product of its (nonzero) digits is 4608, while the sum is 33.

Adding to 18001146813 its reverse (31864110081), we get a palindrome (49865256894).

The spelling of 18001146813 in words is "eighteen billion, one million, one hundred forty-six thousand, eight hundred thirteen".