18749581116945 has 64 divisors (see below), whose sum is σ = 34848577167360. Its totient is φ = 8430342624000.

The previous prime is 18749581116919. The next prime is 18749581116949. The reversal of 18749581116945 is 54961118594781.

It is not a de Polignac number, because 18749581116945 - 2¹⁷ = 18749580985873 is a prime.

It is a super-2 number, since 2×18749581116945² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 18749581116945.

It is not an unprimeable number, because it can be changed into a prime (18749581116949) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 178768770 + ... + 178873620.

It is an arithmetic number, because the mean of its divisors is an integer number (544509018240).

Almost surely, 2^{18749581116945} is an apocalyptic number.

18749581116945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18749581116945 is a deficient number, since it is larger than the sum of its proper divisors (16098996050415).

18749581116945 is a wasteful number, since it uses less digits than its factorization.

18749581116945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132846.

The product of its digits is 87091200, while the sum is 69.

The spelling of 18749581116945 in words is "eighteen trillion, seven hundred forty-nine billion, five hundred eighty-one million, one hundred sixteen thousand, nine hundred forty-five".