1811540236836 has 36 divisors (see below), whose sum is σ = 4646126616656. Its totient is φ = 548951586480.

The previous prime is 1811540236769. The next prime is 1811540236843. The reversal of 1811540236836 is 6386320451181.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 623807170 + ... + 623810073.

Almost surely, 2^{1811540236836} is an apocalyptic number.

It is an amenable number.

1811540236836 is an abundant number, since it is smaller than the sum of its proper divisors (2834586379820).

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

1811540236836 is a wasteful number, since it uses less digits than its factorization.

1811540236836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247617272 (or 1247617259 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 1811540236836 in words is "one trillion, eight hundred eleven billion, five hundred forty million, two hundred thirty-six thousand, eight hundred thirty-six".