64643501525044 has 48 divisors (see below), whose sum is σ = 127126736618112. Its totient is φ = 28537881305472.

The previous prime is 64643501525041. The next prime is 64643501525087. The reversal of 64643501525044 is 44052510534646.

64643501525044 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64643501525041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99185982 + ... + 99835594.

It is an arithmetic number, because the mean of its divisors is an integer number (2648473679544).

Almost surely, 2^{64643501525044} is an apocalyptic number.

It is an amenable number.

64643501525044 is a deficient number, since it is larger than the sum of its proper divisors (62483235093068).

64643501525044 is a wasteful number, since it uses less digits than its factorization.

64643501525044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732856 (or 732854 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 49.

The spelling of 64643501525044 in words is "sixty-four trillion, six hundred forty-three billion, five hundred one million, five hundred twenty-five thousand, forty-four".