642044678122 has 16 divisors (see below), whose sum is σ = 968819304960. Its totient is φ = 319105620592.

The previous prime is 642044678087. The next prime is 642044678159. The reversal of 642044678122 is 221876440246.

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 7 ways as a sum of consecutive naturals, for example, 1659879 + ... + 2009797.

It is an arithmetic number, because the mean of its divisors is an integer number (60551206560).

Almost surely, 2^642044678122 is an apocalyptic number.

642044678122 is a deficient number, since it is larger than the sum of its proper divisors (326774626838).

642044678122 is a wasteful number, since it uses less digits than its factorization.

642044678122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355397.

The product of its (nonzero) digits is 1032192, while the sum is 46.

The spelling of 642044678122 in words is "six hundred forty-two billion, forty-four million, six hundred seventy-eight thousand, one hundred twenty-two".