64644440062004 has 24 divisors (see below), whose sum is σ = 123482273376000. Its totient is φ = 29367131503680.

The previous prime is 64644440061977. The next prime is 64644440062051. The reversal of 64644440062004 is 40026004444646.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 417543929 + ... + 417698720.

It is an arithmetic number, because the mean of its divisors is an integer number (5145094724000).

Almost surely, 2^{64644440062004} is an apocalyptic number.

It is an amenable number.

64644440062004 is a deficient number, since it is larger than the sum of its proper divisors (58837833313996).

64644440062004 is a wasteful number, since it uses less digits than its factorization.

64644440062004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835244423 (or 835244421 counting only the distinct ones).

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

The spelling of 64644440062004 in words is "sixty-four trillion, six hundred forty-four billion, four hundred forty million, sixty-two thousand, four".