8219779569 has 27 divisors (see below), whose sum is σ = 12149902713. Its totient is φ = 5354919432.

The previous prime is 8219779543. The next prime is 8219779577. The reversal of 8219779569 is 9659779128.

The square root of 8219779569 is 90663.

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

8219779569 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8219779569 - 2⁷ = 8219779441 is a prime.

It is a super-2 number, since 2×8219779569² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8219775569) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 12783162 + ... + 12783804.

Almost surely, 2^8219779569 is an apocalyptic number.

8219779569 is the 90663-rd square number.

8219779569 is the 45332-nd centered octagonal number.

It is an amenable number.

8219779569 is a deficient number, since it is larger than the sum of its proper divisors (3930123144).

8219779569 is an frugal number, since it uses more digits than its factorization.

8219779569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386 (or 693 counting only the distinct ones).

The product of its digits is 17146080, while the sum is 63.

The cubic root of 8219779569 is about 2018.1497589762.

The spelling of 8219779569 in words is "eight billion, two hundred nineteen million, seven hundred seventy-nine thousand, five hundred sixty-nine".