18581233969 has 9 divisors (see below), whose sum is σ = 18687203769. Its totient is φ = 18475864020.

The previous prime is 18581233967. The next prime is 18581234027. The reversal of 18581233969 is 96933218581.

The square root of 18581233969 is 136313.

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

It is not a de Polignac number, because 18581233969 - 2¹ = 18581233967 is a prime.

It is a super-2 number, since 2×18581233969² (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 (18581233967) 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, 36940572 + ... + 36941074.

Almost surely, 2^18581233969 is an apocalyptic number.

18581233969 is the 136313-rd square number.

18581233969 is the 68157-th centered octagonal number.

It is an amenable number.

18581233969 is a deficient number, since it is larger than the sum of its proper divisors (105969800).

18581233969 is an frugal number, since it uses more digits than its factorization.

18581233969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548 (or 774 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 55.

The spelling of 18581233969 in words is "eighteen billion, five hundred eighty-one million, two hundred thirty-three thousand, nine hundred sixty-nine".