18745169569 has 9 divisors (see below), whose sum is σ = 21806720337. Its totient is φ = 16066466724.

The previous prime is 18745169551. The next prime is 18745169581. The reversal of 18745169569 is 96596154781.

The square root of 18745169569 is 136913.

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

It is not a de Polignac number, because 18745169569 - 2¹³ = 18745161377 is a prime.

It is a super-2 number, since 2×18745169569² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18745109569) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 948612 + ... + 968170.

Almost surely, 2^18745169569 is an apocalyptic number.

18745169569 is the 136913-rd square number.

18745169569 is the 68457-th centered octagonal number.

It is an amenable number.

18745169569 is a deficient number, since it is larger than the sum of its proper divisors (3061550768).

18745169569 is an frugal number, since it uses more digits than its factorization.

18745169569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39132 (or 19566 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 61.

The spelling of 18745169569 in words is "eighteen billion, seven hundred forty-five million, one hundred sixty-nine thousand, five hundred sixty-nine".