18780043971973 has 8 divisors (see below), whose sum is σ = 19183379592960. Its totient is φ = 18376865026800.

The previous prime is 18780043971911. The next prime is 18780043971989. The reversal of 18780043971973 is 37917934008781.

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 18780043971973 - 2³⁷ = 18642605018501 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18780043971899 and 18780043971908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18780043971473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38926633 + ... + 39406126.

It is an arithmetic number, because the mean of its divisors is an integer number (2397922449120).

Almost surely, 2^{18780043971973} is an apocalyptic number.

It is an amenable number.

18780043971973 is a deficient number, since it is larger than the sum of its proper divisors (403335620987).

18780043971973 is an equidigital number, since it uses as much as digits as its factorization.

18780043971973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78337907.

The product of its (nonzero) digits is 64012032, while the sum is 67.

The spelling of 18780043971973 in words is "eighteen trillion, seven hundred eighty billion, forty-three million, nine hundred seventy-one thousand, nine hundred seventy-three".