64666442622440 has 64 divisors (see below), whose sum is σ = 146374374706560. Its totient is φ = 25711050714880.

The previous prime is 64666442622427. The next prime is 64666442622499. The reversal of 64666442622440 is 4422624466646.

64666442622440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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, 343344695 + ... + 343532985.

It is an arithmetic number, because the mean of its divisors is an integer number (2287099604790).

Almost surely, 2^{64666442622440} is an apocalyptic number.

It is an amenable number.

64666442622440 is an abundant number, since it is smaller than the sum of its proper divisors (81707932084120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64666442622440 is a wasteful number, since it uses less digits than its factorization.

64666442622440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239882 (or 239878 counting only the distinct ones).

The product of its (nonzero) digits is 63700992, while the sum is 56.

The spelling of 64666442622440 in words is "sixty-four trillion, six hundred sixty-six billion, four hundred forty-two million, six hundred twenty-two thousand, four hundred forty".