1818539997320 has 16 divisors (see below), whose sum is σ = 4091714994060. Its totient is φ = 727415998912.

The previous prime is 1818539997277. The next prime is 1818539997331. The reversal of 1818539997320 is 237999358181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1573263472804 + 245276524516 = 1254298^2 + 495254^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22731749927 + ... + 22731750006.

Almost surely, 2^{1818539997320} is an apocalyptic number.

1818539997320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1818539997320 is an abundant number, since it is smaller than the sum of its proper divisors (2273174996740).

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

1818539997320 is a wasteful number, since it uses less digits than its factorization.

1818539997320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45463499944 (or 45463499940 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 65.

The spelling of 1818539997320 in words is "one trillion, eight hundred eighteen billion, five hundred thirty-nine million, nine hundred ninety-seven thousand, three hundred twenty".