6555581589769 has 9 divisors (see below), whose sum is σ = 6963933947431. Its totient is φ = 6169918177120.

The previous prime is 6555581589709. The next prime is 6555581589793. The reversal of 6555581589769 is 9679851855556.

The square root of 6555581589769 is 2560387.

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., 5103826497225 + 1451755092544 = 2259165^2 + 1204888^2 .

It is not a de Polignac number, because 6555581589769 - 2¹¹ = 6555581587721 is a prime.

It is a super-2 number, since 2×6555581589769² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6555581589709) 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, 43451274 + ... + 43601884.

Almost surely, 2^{6555581589769} is an apocalyptic number.

6555581589769 is the 2560387-th square number.

6555581589769 is the 1280194-th centered octagonal number.

It is an amenable number.

6555581589769 is a deficient number, since it is larger than the sum of its proper divisors (408352357662).

6555581589769 is an frugal number, since it uses more digits than its factorization.

6555581589769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301256 (or 150628 counting only the distinct ones).

The product of its digits is 4082400000, while the sum is 79.

The spelling of 6555581589769 in words is "six trillion, five hundred fifty-five billion, five hundred eighty-one million, five hundred eighty-nine thousand, seven hundred sixty-nine".