644516147000 has 64 divisors (see below), whose sum is σ = 1645273974240. Its totient is φ = 234369504000.

The previous prime is 644516146991. The next prime is 644516147057. The reversal of 644516147000 is 741615446.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29285189 + ... + 29307188.

Almost surely, 2^644516147000 is an apocalyptic number.

It is an amenable number.

644516147000 is an abundant number, since it is smaller than the sum of its proper divisors (1000757827240).

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

644516147000 is a wasteful number, since it uses less digits than its factorization.

644516147000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58592409 (or 58592395 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The spelling of 644516147000 in words is "six hundred forty-four billion, five hundred sixteen million, one hundred forty-seven thousand".