642046642666 has 64 divisors (see below), whose sum is σ = 1135413417600. Its totient is φ = 268445548800.

The previous prime is 642046642607. The next prime is 642046642681. The reversal of 642046642666 is 666246640246.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113252880 + ... + 113258548.

It is an arithmetic number, because the mean of its divisors is an integer number (17740834650).

Almost surely, 2^642046642666 is an apocalyptic number.

642046642666 is a deficient number, since it is larger than the sum of its proper divisors (493366774934).

642046642666 is a wasteful number, since it uses less digits than its factorization.

642046642666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7015.

The product of its (nonzero) digits is 11943936, while the sum is 52.

The spelling of 642046642666 in words is "six hundred forty-two billion, forty-six million, six hundred forty-two thousand, six hundred sixty-six".