11806813845 has 24 divisors (see below), whose sum is σ = 21542258400. Its totient is φ = 5965547616.

The previous prime is 11806813841. The next prime is 11806813891. The reversal of 11806813845 is 54831860811.

It is not a de Polignac number, because 11806813845 - 2² = 11806813841 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 11806813845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11806813841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6903715 + ... + 6905424.

It is an arithmetic number, because the mean of its divisors is an integer number (897594100).

Almost surely, 2^11806813845 is an apocalyptic number.

11806813845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11806813845 is a deficient number, since it is larger than the sum of its proper divisors (9735444555).

11806813845 is a wasteful number, since it uses less digits than its factorization.

11806813845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13809169 (or 13809166 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The spelling of 11806813845 in words is "eleven billion, eight hundred six million, eight hundred thirteen thousand, eight hundred forty-five".