644002160242 has 64 divisors (see below), whose sum is σ = 1137480777216. Its totient is φ = 267713994240.

The previous prime is 644002160233. The next prime is 644002160299. The reversal of 644002160242 is 242061200446.

It is a happy number.

644002160242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77427868 + ... + 77436184.

It is an arithmetic number, because the mean of its divisors is an integer number (17773137144).

Almost surely, 2^644002160242 is an apocalyptic number.

644002160242 is a deficient number, since it is larger than the sum of its proper divisors (493478616974).

644002160242 is a wasteful number, since it uses less digits than its factorization.

644002160242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9131.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 644002160242 its reverse (242061200446), we get a palindrome (886063360688).

The spelling of 644002160242 in words is "six hundred forty-four billion, two million, one hundred sixty thousand, two hundred forty-two".