64443234533 has 4 divisors (see below), whose sum is σ = 64471588428. Its totient is φ = 64414880640.

The previous prime is 64443234523. The next prime is 64443234547. The reversal of 64443234533 is 33543234446.

64443234533 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28730928004 + 35712306529 = 169502^2 + 188977^2 .

It is a cyclic number.

It is not a de Polignac number, because 64443234533 - 2¹⁴ = 64443218149 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 (64443234523) 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, 14173538 + ... + 14178083.

It is an arithmetic number, because the mean of its divisors is an integer number (16117897107).

Almost surely, 2^64443234533 is an apocalyptic number.

It is an amenable number.

64443234533 is a deficient number, since it is larger than the sum of its proper divisors (28353895).

64443234533 is a wasteful number, since it uses less digits than its factorization.

64443234533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28353894.

The product of its digits is 1244160, while the sum is 41.

Adding to 64443234533 its reverse (33543234446), we get a palindrome (97986468979).

The spelling of 64443234533 in words is "sixty-four billion, four hundred forty-three million, two hundred thirty-four thousand, five hundred thirty-three".