18400786845 has 64 divisors (see below), whose sum is σ = 33881573376. Its totient is φ = 8353393920.

The previous prime is 18400786843. The next prime is 18400786883. The reversal of 18400786845 is 54868700481.

It is not a de Polignac number, because 18400786845 - 2¹ = 18400786843 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18400786843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12894022 + ... + 12895448.

It is an arithmetic number, because the mean of its divisors is an integer number (529399584).

Almost surely, 2^18400786845 is an apocalyptic number.

18400786845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18400786845 is a deficient number, since it is larger than the sum of its proper divisors (15480786531).

18400786845 is a wasteful number, since it uses less digits than its factorization.

18400786845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210.

The product of its (nonzero) digits is 1720320, while the sum is 51.

The spelling of 18400786845 in words is "eighteen billion, four hundred million, seven hundred eighty-six thousand, eight hundred forty-five".