6442660406642 has 32 divisors (see below), whose sum is σ = 10285284500352. Its totient is φ = 3019941743104.

The previous prime is 6442660406641. The next prime is 6442660406647. The reversal of 6442660406642 is 2466040662446.

It is not an unprimeable number, because it can be changed into a prime (6442660406641) 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, 913538 + ... + 3704034.

It is an arithmetic number, because the mean of its divisors is an integer number (321415140636).

Almost surely, 2^{6442660406642} is an apocalyptic number.

6442660406642 is a deficient number, since it is larger than the sum of its proper divisors (3842624093710).

6442660406642 is a wasteful number, since it uses less digits than its factorization.

6442660406642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2791522.

The product of its (nonzero) digits is 7962624, while the sum is 50.

The spelling of 6442660406642 in words is "six trillion, four hundred forty-two billion, six hundred sixty million, four hundred six thousand, six hundred forty-two".