6659384781 has 16 divisors (see below), whose sum is σ = 10152604800. Its totient is φ = 3803498688.

The previous prime is 6659384773. The next prime is 6659384783. The reversal of 6659384781 is 1874839566.

It is not a de Polignac number, because 6659384781 - 2³ = 6659384773 is a prime.

It is a super-2 number, since 2×6659384781² = 88694811322828835922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6659384783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33186 + ... + 120083.

It is an arithmetic number, because the mean of its divisors is an integer number (634537800).

Almost surely, 2^6659384781 is an apocalyptic number.

It is an amenable number.

6659384781 is a deficient number, since it is larger than the sum of its proper divisors (3493220019).

6659384781 is a wasteful number, since it uses less digits than its factorization.

6659384781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155348.

The product of its digits is 8709120, while the sum is 57.

The square root of 6659384781 is about 81605.0536486559. The cubic root of 6659384781 is about 1881.3865564373.

The spelling of 6659384781 in words is "six billion, six hundred fifty-nine million, three hundred eighty-four thousand, seven hundred eighty-one".