18891688043 has 8 divisors (see below), whose sum is σ = 19780352928. Its totient is φ = 18008630464.

The previous prime is 18891688037. The next prime is 18891688061. The reversal of 18891688043 is 34088619881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18891688043 - 2¹⁶ = 18891622507 is a prime.

It is a super-2 number, since 2×18891688043² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18891688043.

It is not an unprimeable number, because it can be changed into a prime (18891688063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1394930 + ... + 1408407.

It is an arithmetic number, because the mean of its divisors is an integer number (2472544116).

Almost surely, 2^18891688043 is an apocalyptic number.

18891688043 is a deficient number, since it is larger than the sum of its proper divisors (888664885).

18891688043 is a wasteful number, since it uses less digits than its factorization.

18891688043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803653.

The product of its (nonzero) digits is 2654208, while the sum is 56.

The spelling of 18891688043 in words is "eighteen billion, eight hundred ninety-one million, six hundred eighty-eight thousand, forty-three".