6647522401 has 4 divisors (see below), whose sum is σ = 7158870292. Its totient is φ = 6136174512.

The previous prime is 6647522333. The next prime is 6647522429. The reversal of 6647522401 is 1042257466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3372821776 + 3274700625 = 58076^2 + 57225^2 .

It is not a de Polignac number, because 6647522401 - 2⁹ = 6647521889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6647522471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255673926 + ... + 255673951.

It is an arithmetic number, because the mean of its divisors is an integer number (1789717573).

Almost surely, 2^6647522401 is an apocalyptic number.

It is an amenable number.

6647522401 is a deficient number, since it is larger than the sum of its proper divisors (511347891).

6647522401 is a wasteful number, since it uses less digits than its factorization.

6647522401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511347890.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 6647522401 is about 81532.3396021481. The cubic root of 6647522401 is about 1880.2687861696.

Adding to 6647522401 its reverse (1042257466), we get a palindrome (7689779867).

The spelling of 6647522401 in words is "six billion, six hundred forty-seven million, five hundred twenty-two thousand, four hundred one".