64004035521 has 8 divisors (see below), whose sum is σ = 85340631040. Its totient is φ = 42668398512.

The previous prime is 64004035507. The next prime is 64004035541. The reversal of 64004035521 is 12553040046.

64004035521 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 64004035521 - 2⁹ = 64004035009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64004035541) 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, 65806 + ... + 363783.

It is an arithmetic number, because the mean of its divisors is an integer number (10667578880).

Almost surely, 2^64004035521 is an apocalyptic number.

It is an amenable number.

64004035521 is a deficient number, since it is larger than the sum of its proper divisors (21336595519).

64004035521 is a wasteful number, since it uses less digits than its factorization.

64004035521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479255.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 64004035521 its reverse (12553040046), we get a palindrome (76557075567).

The spelling of 64004035521 in words is "sixty-four billion, four million, thirty-five thousand, five hundred twenty-one".