18321667287473 has 12 divisors (see below), whose sum is σ = 20141716402164. Its totient is φ = 16653559903200.

The previous prime is 18321667287463. The next prime is 18321667287541. The reversal of 18321667287473 is 37478276612381.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16297102559089 + 2024564728384 = 4036967^2 + 1422872^2 .

It is not a de Polignac number, because 18321667287473 - 2¹² = 18321667283377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18321667287403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10560086 + ... + 12172047.

It is an arithmetic number, because the mean of its divisors is an integer number (1678476366847).

Almost surely, 2^{18321667287473} is an apocalyptic number.

It is an amenable number.

18321667287473 is a deficient number, since it is larger than the sum of its proper divisors (1820049114691).

18321667287473 is a wasteful number, since it uses less digits than its factorization.

18321667287473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22738816 (or 22738805 counting only the distinct ones).

The product of its digits is 113799168, while the sum is 65.

The spelling of 18321667287473 in words is "eighteen trillion, three hundred twenty-one billion, six hundred sixty-seven million, two hundred eighty-seven thousand, four hundred seventy-three".