6447245665 has 16 divisors (see below), whose sum is σ = 9362051712. Its totient is φ = 4160911104.

The previous prime is 6447245647. The next prime is 6447245681. The reversal of 6447245665 is 5665427446.

It is not a de Polignac number, because 6447245665 - 2¹³ = 6447237473 is a prime.

It is a super-2 number, since 2×6447245665² = 83133953329722584450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5417259 + ... + 5418448.

It is an arithmetic number, because the mean of its divisors is an integer number (585128232).

Almost surely, 2^6447245665 is an apocalyptic number.

It is an amenable number.

6447245665 is a deficient number, since it is larger than the sum of its proper divisors (2914806047).

6447245665 is a wasteful number, since it uses less digits than its factorization.

6447245665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10835736.

The product of its digits is 4838400, while the sum is 49.

The square root of 6447245665 is about 80294.7424493036. The cubic root of 6447245665 is about 1861.1929820222.

The spelling of 6447245665 in words is "six billion, four hundred forty-seven million, two hundred forty-five thousand, six hundred sixty-five".