18124400085891 has 32 divisors (see below), whose sum is σ = 28003268906496. Its totient is φ = 10305096384000.

The previous prime is 18124400085889. The next prime is 18124400085907. The reversal of 18124400085891 is 19858000442181.

It is not a de Polignac number, because 18124400085891 - 2¹ = 18124400085889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (18124400085691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51766540 + ... + 52115481.

It is an arithmetic number, because the mean of its divisors is an integer number (875102153328).

Almost surely, 2^{18124400085891} is an apocalyptic number.

18124400085891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18124400085891 is a deficient number, since it is larger than the sum of its proper divisors (9878868820605).

18124400085891 is a wasteful number, since it uses less digits than its factorization.

18124400085891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103882363.

The product of its (nonzero) digits is 737280, while the sum is 51.

The spelling of 18124400085891 in words is "eighteen trillion, one hundred twenty-four billion, four hundred million, eighty-five thousand, eight hundred ninety-one".