6442647555 has 16 divisors (see below), whose sum is σ = 10309631904. Its totient is φ = 3435613440.

The previous prime is 6442647551. The next prime is 6442647557. The reversal of 6442647555 is 5557462446.

It is not a de Polignac number, because 6442647555 - 2² = 6442647551 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (6442647551) 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, 105477 + ... + 154953.

It is an arithmetic number, because the mean of its divisors is an integer number (644351994).

Almost surely, 2^6442647555 is an apocalyptic number.

6442647555 is a deficient number, since it is larger than the sum of its proper divisors (3866984349).

6442647555 is a wasteful number, since it uses less digits than its factorization.

6442647555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58166.

The product of its digits is 4032000, while the sum is 48.

The square root of 6442647555 is about 80266.1046457345. The cubic root of 6442647555 is about 1860.7504154959.

The spelling of 6442647555 in words is "six billion, four hundred forty-two million, six hundred forty-seven thousand, five hundred fifty-five".