6665579449 has 9 divisors (see below), whose sum is σ = 7036501167. Its totient is φ = 6313289904.

The previous prime is 6665579407. The next prime is 6665579509. The reversal of 6665579449 is 9449755666.

The square root of 6665579449 is 81643.

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., 3570660025 + 3094919424 = 59755^2 + 55632^2 .

It is not a de Polignac number, because 6665579449 - 2¹⁵ = 6665546681 is a prime.

It is a super-2 number, since 2×6665579449² = 88859898781862287202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6665571449) 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, 1549069 + ... + 1553365.

It is an arithmetic number, because the mean of its divisors is an integer number (781833463).

Almost surely, 2^6665579449 is an apocalyptic number.

6665579449 is the 81643-rd square number.

6665579449 is the 40822-nd centered octagonal number.

It is an amenable number.

6665579449 is a deficient number, since it is larger than the sum of its proper divisors (370921718).

6665579449 is an frugal number, since it uses more digits than its factorization.

6665579449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8632 (or 4316 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 61.

The cubic root of 6665579449 is about 1881.9697411003.

The spelling of 6665579449 in words is "six billion, six hundred sixty-five million, five hundred seventy-nine thousand, four hundred forty-nine".