644283210622242 has 16 divisors (see below), whose sum is σ = 1292258588644800. Its totient is φ = 214145708974032.

The previous prime is 644283210622217. The next prime is 644283210622283. The reversal of 644283210622242 is 242226012382446.

It is a super-4 number, since 4×644283210622242⁴ (a number of 60 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 644283210622191 and 644283210622200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153840306078 + ... + 153840310265.

It is an arithmetic number, because the mean of its divisors is an integer number (80766161790300).

Almost surely, 2^{644283210622242} is an apocalyptic number.

644283210622242 is an abundant number, since it is smaller than the sum of its proper divisors (647975378022558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644283210622242 is a wasteful number, since it uses less digits than its factorization.

644283210622242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307680616697.

The product of its (nonzero) digits is 3538944, while the sum is 48.

The spelling of 644283210622242 in words is "six hundred forty-four trillion, two hundred eighty-three billion, two hundred ten million, six hundred twenty-two thousand, two hundred forty-two".