18923578969 has 9 divisors (see below), whose sum is σ = 19785423679. Its totient is φ = 18097788280.

The previous prime is 18923578967. The next prime is 18923579011. The reversal of 18923578969 is 96987532981.

The square root of 18923578969 is 137563.

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

It can be written as a sum of positive squares in only one way, i.e., 509088969 + 18414490000 = 22563^2 + 135700^2 .

It is not a de Polignac number, because 18923578969 - 2¹ = 18923578967 is a prime.

It is a super-2 number, since 2×18923578969² (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 (18923578963) 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, 3160959 + ... + 3166939.

Almost surely, 2^18923578969 is an apocalyptic number.

18923578969 is the 137563-rd square number.

18923578969 is the 68782-nd centered octagonal number.

It is an amenable number.

18923578969 is a deficient number, since it is larger than the sum of its proper divisors (861844710).

18923578969 is an frugal number, since it uses more digits than its factorization.

18923578969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12008 (or 6004 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 67.

The spelling of 18923578969 in words is "eighteen billion, nine hundred twenty-three million, five hundred seventy-eight thousand, nine hundred sixty-nine".