6444550642 has 16 divisors (see below), whose sum is σ = 10333153152. Its totient is φ = 3007000480.

The previous prime is 6444550639. The next prime is 6444550643. The reversal of 6444550642 is 2460554446.

It is a happy number.

It is a super-2 number, since 2×6444550642² = 83064465954605224328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6444550595 and 6444550604.

It is not an unprimeable number, because it can be changed into a prime (6444550643) 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, 1706638 + ... + 1710409.

It is an arithmetic number, because the mean of its divisors is an integer number (645822072).

Almost surely, 2^6444550642 is an apocalyptic number.

6444550642 is a deficient number, since it is larger than the sum of its proper divisors (3888602510).

6444550642 is a wasteful number, since it uses less digits than its factorization.

6444550642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3417113.

The product of its (nonzero) digits is 460800, while the sum is 40.

The square root of 6444550642 is about 80277.9586312457. The cubic root of 6444550642 is about 1860.9336125061.

The spelling of 6444550642 in words is "six billion, four hundred forty-four million, five hundred fifty thousand, six hundred forty-two".