642222256066 has 16 divisors (see below), whose sum is σ = 986835409920. Its totient is φ = 313360019280.

The previous prime is 642222256063. The next prime is 642222256079. The reversal of 642222256066 is 660652222246.

It is not an unprimeable number, because it can be changed into a prime (642222256063) by changing a digit.

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, 20709376 + ... + 20740363.

It is an arithmetic number, because the mean of its divisors is an integer number (61677213120).

Almost surely, 2^642222256066 is an apocalyptic number.

642222256066 is a deficient number, since it is larger than the sum of its proper divisors (344613153854).

642222256066 is a wasteful number, since it uses less digits than its factorization.

642222256066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41449929.

The product of its (nonzero) digits is 829440, while the sum is 43.

The spelling of 642222256066 in words is "six hundred forty-two billion, two hundred twenty-two million, two hundred fifty-six thousand, sixty-six".