64644453843 has 8 divisors (see below), whose sum is σ = 86223192000. Its totient is φ = 43081009128.

The previous prime is 64644453761. The next prime is 64644453847. The reversal of 64644453843 is 34835444646.

64644453843 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 64644453843 - 2¹³ = 64644445651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64644453847) 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, 3813493 + ... + 3830406.

It is an arithmetic number, because the mean of its divisors is an integer number (10777899000).

Almost surely, 2^64644453843 is an apocalyptic number.

64644453843 is a deficient number, since it is larger than the sum of its proper divisors (21578738157).

64644453843 is a wasteful number, since it uses less digits than its factorization.

64644453843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7646721.

The product of its digits is 13271040, while the sum is 51.

The spelling of 64644453843 in words is "sixty-four billion, six hundred forty-four million, four hundred fifty-three thousand, eight hundred forty-three".