6489784408581 has 8 divisors (see below), whose sum is σ = 9614495420160. Its totient is φ = 4326522939036.

The previous prime is 6489784408577. The next prime is 6489784408621. The reversal of 6489784408581 is 1858044879846.

It is a happy number.

6489784408581 is a `hidden beast` number, since 6 + 4 + 8 + 97 + 84 + 408 + 58 + 1 = 666.

It is not a de Polignac number, because 6489784408581 - 2² = 6489784408577 is a prime.

It is a super-2 number, since 2×6489784408581² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6489784408381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120181192725 + ... + 120181192778.

It is an arithmetic number, because the mean of its divisors is an integer number (1201811927520).

Almost surely, 2^{6489784408581} is an apocalyptic number.

It is an amenable number.

6489784408581 is a deficient number, since it is larger than the sum of its proper divisors (3124711011579).

6489784408581 is a wasteful number, since it uses less digits than its factorization.

6489784408581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240362385512 (or 240362385506 counting only the distinct ones).

The product of its (nonzero) digits is 495452160, while the sum is 72.

The spelling of 6489784408581 in words is "six trillion, four hundred eighty-nine billion, seven hundred eighty-four million, four hundred eight thousand, five hundred eighty-one".