664445544501044 has 12 divisors (see below), whose sum is σ = 1163494380025824. Its totient is φ = 332018578779384.

The previous prime is 664445544500999. The next prime is 664445544501047. The reversal of 664445544501044 is 440105445544466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664445544501047) 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, 51048360464 + ... + 51048373479.

It is an arithmetic number, because the mean of its divisors is an integer number (96957865002152).

Almost surely, 2^{664445544501044} is an apocalyptic number.

It is an amenable number.

664445544501044 is a deficient number, since it is larger than the sum of its proper divisors (499048835524780).

664445544501044 is a wasteful number, since it uses less digits than its factorization.

664445544501044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102096735574 (or 102096735572 counting only the distinct ones).

The product of its (nonzero) digits is 73728000, while the sum is 56.

The spelling of 664445544501044 in words is "six hundred sixty-four trillion, four hundred forty-five billion, five hundred forty-four million, five hundred one thousand, forty-four".