644597795446 has 8 divisors (see below), whose sum is σ = 1054796392584. Its totient is φ = 292998997920.

The previous prime is 644597795441. The next prime is 644597795483.

It is a happy number.

644597795446 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644597795441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14649949875 + ... + 14649949918.

It is an arithmetic number, because the mean of its divisors is an integer number (131849549073).

Almost surely, 2^644597795446 is an apocalyptic number.

644597795446 is a deficient number, since it is larger than the sum of its proper divisors (410198597138).

644597795446 is a wasteful number, since it uses less digits than its factorization.

644597795446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29299899806.

The product of its digits is 914457600, while the sum is 70.

The spelling of 644597795446 in words is "six hundred forty-four billion, five hundred ninety-seven million, seven hundred ninety-five thousand, four hundred forty-six".