6648709581 has 16 divisors (see below), whose sum is σ = 9851198400. Its totient is φ = 4431906864.

The previous prime is 6648709553. The next prime is 6648709583. The reversal of 6648709581 is 1859078466.

It is not a de Polignac number, because 6648709581 - 2⁶ = 6648709517 is a prime.

It is a super-2 number, since 2×6648709581² = 88410678184962391122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6648709583) 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, 387670 + ... + 404456.

It is an arithmetic number, because the mean of its divisors is an integer number (615699900).

Almost surely, 2^6648709581 is an apocalyptic number.

It is an amenable number.

6648709581 is a deficient number, since it is larger than the sum of its proper divisors (3202488819).

6648709581 is a wasteful number, since it uses less digits than its factorization.

6648709581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31465 (or 31459 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The square root of 6648709581 is about 81539.6197010999. The cubic root of 6648709581 is about 1880.3807118110.

The spelling of 6648709581 in words is "six billion, six hundred forty-eight million, seven hundred nine thousand, five hundred eighty-one".