6647259649 has 8 divisors (see below), whose sum is σ = 7021002240. Its totient is φ = 6275905776.

The previous prime is 6647259643. The next prime is 6647259659. The reversal of 6647259649 is 9469527466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6647259649 - 2⁵ = 6647259617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6647259593 and 6647259602.

It is not an unprimeable number, because it can be changed into a prime (6647259643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591457 + ... + 602590.

It is an arithmetic number, because the mean of its divisors is an integer number (877625280).

Almost surely, 2^6647259649 is an apocalyptic number.

It is an amenable number.

6647259649 is a deficient number, since it is larger than the sum of its proper divisors (373742591).

6647259649 is a wasteful number, since it uses less digits than its factorization.

6647259649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194359.

The product of its digits is 19595520, while the sum is 58.

The square root of 6647259649 is about 81530.7282501512. The cubic root of 6647259649 is about 1880.2440124838.

The spelling of 6647259649 in words is "six billion, six hundred forty-seven million, two hundred fifty-nine thousand, six hundred forty-nine".