642744160838 has 8 divisors (see below), whose sum is σ = 1038279029088. Its totient is φ = 296651151144.

The previous prime is 642744160811. The next prime is 642744160843. The reversal of 642744160838 is 838061447246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 642744160838.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12360464606 + ... + 12360464657.

It is an arithmetic number, because the mean of its divisors is an integer number (129784878636).

Almost surely, 2^642744160838 is an apocalyptic number.

642744160838 is a deficient number, since it is larger than the sum of its proper divisors (395534868250).

642744160838 is a wasteful number, since it uses less digits than its factorization.

642744160838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24720929278.

The product of its (nonzero) digits is 6193152, while the sum is 53.

The spelling of 642744160838 in words is "six hundred forty-two billion, seven hundred forty-four million, one hundred sixty thousand, eight hundred thirty-eight".