6459993647 has 8 divisors (see below), whose sum is σ = 6744124800. Its totient is φ = 6176134360.

The previous prime is 6459993643. The next prime is 6459993649. The reversal of 6459993647 is 7463999546.

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 6459993647 - 2² = 6459993643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6459993647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6459993643) 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, 18629 + ... + 115182.

It is an arithmetic number, because the mean of its divisors is an integer number (843015600).

Almost surely, 2^6459993647 is an apocalyptic number.

6459993647 is a deficient number, since it is larger than the sum of its proper divisors (284131153).

6459993647 is a wasteful number, since it uses less digits than its factorization.

6459993647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135933.

The product of its digits is 44089920, while the sum is 62.

The square root of 6459993647 is about 80374.0856682053. The cubic root of 6459993647 is about 1862.4188716039.

The spelling of 6459993647 in words is "six billion, four hundred fifty-nine million, nine hundred ninety-three thousand, six hundred forty-seven".