6442551044 has 24 divisors (see below), whose sum is σ = 11435194680. Its totient is φ = 3175612416.

The previous prime is 6442551043. The next prime is 6442551133. The reversal of 6442551044 is 4401552446.

It can be written as a sum of positive squares in 4 ways, for example, as 3648160000 + 2794391044 = 60400^2 + 52862^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6442550995 and 6442551013.

It is not an unprimeable number, because it can be changed into a prime (6442551043) 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, 67412 + ... + 132020.

It is an arithmetic number, because the mean of its divisors is an integer number (476466445).

Almost surely, 2^6442551044 is an apocalyptic number.

It is an amenable number.

6442551044 is a deficient number, since it is larger than the sum of its proper divisors (4992643636).

6442551044 is a wasteful number, since it uses less digits than its factorization.

6442551044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64967 (or 64965 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 35.

The square root of 6442551044 is about 80265.5034494894. The cubic root of 6442551044 is about 1860.7411240890.

The spelling of 6442551044 in words is "six billion, four hundred forty-two million, five hundred fifty-one thousand, forty-four".