6469814477889 has 27 divisors (see below), whose sum is σ = 10871138569473. Its totient is φ = 3697006321512.

The previous prime is 6469814477821. The next prime is 6469814477921. The reversal of 6469814477889 is 9887744189646.

The square root of 6469814477889 is 2543583.

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

6469814477889 is a `hidden beast` number, since 6 + 4 + 6 + 98 + 1 + 447 + 7 + 8 + 89 = 666.

It is not a de Polignac number, because 6469814477889 - 2⁹ = 6469814477377 is a prime.

It is a super-2 number, since 2×6469814477889² (a number of 26 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6469814475889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 53354682 + ... + 53475804.

Almost surely, 2^{6469814477889} is an apocalyptic number.

6469814477889 is the 2543583-rd square number.

6469814477889 is the 1271792-nd centered octagonal number.

It is an amenable number.

6469814477889 is a deficient number, since it is larger than the sum of its proper divisors (4401324091584).

6469814477889 is an frugal number, since it uses more digits than its factorization.

6469814477889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242266 (or 121133 counting only the distinct ones).

The product of its digits is 4682022912, while the sum is 81.

Multiplying 6469814477889 by its sum of digits (81), we get a square (524054972709009 = 22892247²).

The spelling of 6469814477889 in words is "six trillion, four hundred sixty-nine billion, eight hundred fourteen million, four hundred seventy-seven thousand, eight hundred eighty-nine".