18309744470681 has 32 divisors (see below), whose sum is σ = 20475489484800. Its totient is φ = 16292313031680.

The previous prime is 18309744470639. The next prime is 18309744470687. The reversal of 18309744470681 is 18607444790381.

It is not a de Polignac number, because 18309744470681 - 2¹⁰ = 18309744469657 is a prime.

It is a super-2 number, since 2×18309744470681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18309744470687) 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 31 ways as a sum of consecutive naturals, for example, 5341160 + ... + 8071398.

It is an arithmetic number, because the mean of its divisors is an integer number (639859046400).

Almost surely, 2^{18309744470681} is an apocalyptic number.

It is an amenable number.

18309744470681 is a deficient number, since it is larger than the sum of its proper divisors (2165745014119).

18309744470681 is a wasteful number, since it uses less digits than its factorization.

18309744470681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2730569.

The product of its (nonzero) digits is 32514048, while the sum is 62.

The spelling of 18309744470681 in words is "eighteen trillion, three hundred nine billion, seven hundred forty-four million, four hundred seventy thousand, six hundred eighty-one".