18019710871369 has 3 divisors (see below), whose sum is σ = 18019715116333. Its totient is φ = 18019706626406.

The previous prime is 18019710871277. The next prime is 18019710871399. The reversal of 18019710871369 is 96317801791081.

The square root of 18019710871369 is 4244963.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 18019710871369 - 2¹⁵ = 18019710838601 is a prime.

It is a super-2 number, since 2×18019710871369² (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 (18019710871399) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2122482 + ... + 6367444.

Almost surely, 2^{18019710871369} is an apocalyptic number.

18019710871369 is the 4244963-rd square number.

18019710871369 is the 2122482-nd centered octagonal number.

It is an amenable number.

18019710871369 is a deficient number, since it is larger than the sum of its proper divisors (4244964).

18019710871369 is an frugal number, since it uses more digits than its factorization.

18019710871369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8489926 (or 4244963 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 61.

The spelling of 18019710871369 in words is "eighteen trillion, nineteen billion, seven hundred ten million, eight hundred seventy-one thousand, three hundred sixty-nine".