18472343569 has 3 divisors (see below), whose sum is σ = 18472479483. Its totient is φ = 18472207656.

The previous prime is 18472343537. The next prime is 18472343587. The reversal of 18472343569 is 96534327481.

It is a happy number.

The square root of 18472343569 is 135913.

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 can be written as a sum of positive squares in only one way, i.e., 14157430225 + 4314913344 = 118985^2 + 65688^2 .

It is not a de Polignac number, because 18472343569 - 2⁵ = 18472343537 is a prime.

It is a super-2 number, since 2×18472343569² (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 (18472343269) 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, 67957 + ... + 203869.

It is an arithmetic number, because the mean of its divisors is an integer number (6157493161).

Almost surely, 2^18472343569 is an apocalyptic number.

18472343569 is the 135913-rd square number.

18472343569 is the 67957-th centered octagonal number.

It is an amenable number.

18472343569 is a deficient number, since it is larger than the sum of its proper divisors (135914).

18472343569 is an frugal number, since it uses more digits than its factorization.

18472343569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271826 (or 135913 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 52.

The spelling of 18472343569 in words is "eighteen billion, four hundred seventy-two million, three hundred forty-three thousand, five hundred sixty-nine".