1818211815388 has 12 divisors (see below), whose sum is σ = 3184630330000. Its totient is φ = 908317435392.

The previous prime is 1818211815313. The next prime is 1818211815419. The reversal of 1818211815388 is 8835181128181.

It is a congruent number.

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, 197112888 + ... + 197122111.

Almost surely, 2^{1818211815388} is an apocalyptic number.

It is an amenable number.

1818211815388 is a deficient number, since it is larger than the sum of its proper divisors (1366418514612).

1818211815388 is a wasteful number, since it uses less digits than its factorization.

1818211815388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394236156 (or 394236154 counting only the distinct ones).

The product of its digits is 983040, while the sum is 55.

The spelling of 1818211815388 in words is "one trillion, eight hundred eighteen billion, two hundred eleven million, eight hundred fifteen thousand, three hundred eighty-eight".