64443065621 has 8 divisors (see below), whose sum is σ = 71091432000. Its totient is φ = 57926350240.

The previous prime is 64443065579. The next prime is 64443065641. The reversal of 64443065621 is 12656034446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-64443065621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64443065641) 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, 32911721 + ... + 32913678.

It is an arithmetic number, because the mean of its divisors is an integer number (8886429000).

Almost surely, 2^64443065621 is an apocalyptic number.

It is an amenable number.

64443065621 is a deficient number, since it is larger than the sum of its proper divisors (6648366379).

64443065621 is a wasteful number, since it uses less digits than its factorization.

64443065621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65825499.

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 64443065621 in words is "sixty-four billion, four hundred forty-three million, sixty-five thousand, six hundred twenty-one".