6444500642 has 4 divisors (see below), whose sum is σ = 9666750966. Its totient is φ = 3222250320.

The previous prime is 6444500609. The next prime is 6444500681. The reversal of 6444500642 is 2460054446.

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

It can be written as a sum of positive squares in only one way, i.e., 4707194881 + 1737305761 = 68609^2 + 41681^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1611125159 + ... + 1611125162.

Almost surely, 2^6444500642 is an apocalyptic number.

6444500642 is a deficient number, since it is larger than the sum of its proper divisors (3222250324).

6444500642 is a wasteful number, since it uses less digits than its factorization.

6444500642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3222250323.

The product of its (nonzero) digits is 92160, while the sum is 35.

The square root of 6444500642 is about 80277.6472126581. The cubic root of 6444500642 is about 1860.9287998136.

The spelling of 6444500642 in words is "six billion, four hundred forty-four million, five hundred thousand, six hundred forty-two".