644835219474 has 8 divisors (see below), whose sum is σ = 1289670438960. Its totient is φ = 214945073156.

The previous prime is 644835219443. The next prime is 644835219481. The reversal of 644835219474 is 474912538446.

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

644835219474 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53736268284 + ... + 53736268295.

It is an arithmetic number, because the mean of its divisors is an integer number (161208804870).

Almost surely, 2^644835219474 is an apocalyptic number.

644835219474 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

644835219474 is a wasteful number, since it uses less digits than its factorization.

644835219474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107472536584.

The product of its digits is 23224320, while the sum is 57.

The spelling of 644835219474 in words is "six hundred forty-four billion, eight hundred thirty-five million, two hundred nineteen thousand, four hundred seventy-four".