644241020486 has 16 divisors (see below), whose sum is σ = 1107167335200. Its totient is φ = 275414755200.

The previous prime is 644241020483. The next prime is 644241020597. The reversal of 644241020486 is 684020142446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644241020483) 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, 57372461 + ... + 57383688.

It is an arithmetic number, because the mean of its divisors is an integer number (69197958450).

Almost surely, 2^644241020486 is an apocalyptic number.

644241020486 is a deficient number, since it is larger than the sum of its proper divisors (462926314714).

644241020486 is a wasteful number, since it uses less digits than its factorization.

644241020486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114756559.

The product of its (nonzero) digits is 294912, while the sum is 41.

The spelling of 644241020486 in words is "six hundred forty-four billion, two hundred forty-one million, twenty thousand, four hundred eighty-six".