810000000018 has 48 divisors (see below), whose sum is σ = 1918967240736. Its totient is φ = 244887649920.

The previous prime is 809999999959. The next prime is 810000000023.

It is a happy number.

810000000018 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×810000000018² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

810000000018 is a strobogrammatic number because it is the same when read upside-down.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4638180 + ... + 4809647.

It is an arithmetic number, because the mean of its divisors is an integer number (39978484182).

Almost surely, 2^810000000018 is an apocalyptic number.

810000000018 is an abundant number, since it is smaller than the sum of its proper divisors (1108967240718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

810000000018 is a wasteful number, since it uses less digits than its factorization.

810000000018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9448279 (or 9448276 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Subtracting from 810000000018 its sum of digits (18), we obtain a square (810000000000 = 900000²).

It can be divided in two parts, 8100000000 and 18, that added together give a palindrome (8100000018).

The spelling of 810000000018 in words is "eight hundred ten billion, eighteen", and thus it is an aban number.