64644600200444 has 24 divisors (see below), whose sum is σ = 123452371047600. Its totient is φ = 29374396686080.

The previous prime is 64644600200441. The next prime is 64644600200561. The reversal of 64644600200444 is 44400200644646.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 64644600200395 and 64644600200404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64644600200441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237674939 + ... + 237946770.

It is an arithmetic number, because the mean of its divisors is an integer number (5143848793650).

Almost surely, 2^{64644600200444} is an apocalyptic number.

It is an amenable number.

64644600200444 is a deficient number, since it is larger than the sum of its proper divisors (58807770847156).

64644600200444 is a wasteful number, since it uses less digits than its factorization.

64644600200444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475624813 (or 475624811 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 44.

The spelling of 64644600200444 in words is "sixty-four trillion, six hundred forty-four billion, six hundred million, two hundred thousand, four hundred forty-four".