1818734378181 has 64 divisors (see below), whose sum is σ = 2912565067776. Its totient is φ = 986994360000.

The previous prime is 1818734378177. The next prime is 1818734378203.

It is a happy number.

1818734378181 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1818734378181 - 2² = 1818734378177 is a prime.

It is a super-2 number, since 2×1818734378181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818734378581) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 171460180 + ... + 171470786.

It is an arithmetic number, because the mean of its divisors is an integer number (45508829184).

Almost surely, 2^{1818734378181} is an apocalyptic number.

It is an amenable number.

1818734378181 is a deficient number, since it is larger than the sum of its proper divisors (1093830689595).

1818734378181 is a wasteful number, since it uses less digits than its factorization.

1818734378181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13142.

The product of its digits is 7225344, while the sum is 60.

The spelling of 1818734378181 in words is "one trillion, eight hundred eighteen billion, seven hundred thirty-four million, three hundred seventy-eight thousand, one hundred eighty-one".