1818552040369 has 3 divisors (see below), whose sum is σ = 1818553388907. Its totient is φ = 1818550691832.

The previous prime is 1818552040351. The next prime is 1818552040373. The reversal of 1818552040369 is 9630402558181.

It is a happy number.

The square root of 1818552040369 is 1348537.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1575589800625 + 242962239744 = 1255225^2 + 492912^2 .

It is not a de Polignac number, because 1818552040369 - 2⁵ = 1818552040337 is a prime.

It is a super-2 number, since 2×1818552040369² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1818552010369) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 674269 + ... + 2022805.

It is an arithmetic number, because the mean of its divisors is an integer number (606184462969).

Almost surely, 2^{1818552040369} is an apocalyptic number.

1818552040369 is the 1348537-th square number.

1818552040369 is the 674269-th centered octagonal number.

It is an amenable number.

1818552040369 is a deficient number, since it is larger than the sum of its proper divisors (1348538).

1818552040369 is an frugal number, since it uses more digits than its factorization.

1818552040369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2697074 (or 1348537 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 52.

The spelling of 1818552040369 in words is "one trillion, eight hundred eighteen billion, five hundred fifty-two million, forty thousand, three hundred sixty-nine".