664464466140521 has 8 divisors (see below), whose sum is σ = 687377484984000. Its totient is φ = 641551477366800.

The previous prime is 664464466140491. The next prime is 664464466140539. The reversal of 664464466140521 is 125041664464466.

It is a happy number.

664464466140521 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 a cyclic number.

It is not a de Polignac number, because 664464466140521 - 2⁶ = 664464466140457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664464466143521) 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, 43250630 + ... + 56564528.

It is an arithmetic number, because the mean of its divisors is an integer number (85922185623000).

Almost surely, 2^{664464466140521} is an apocalyptic number.

It is an amenable number.

664464466140521 is a deficient number, since it is larger than the sum of its proper divisors (22913018843479).

664464466140521 is a wasteful number, since it uses less digits than its factorization.

664464466140521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15034879.

The product of its (nonzero) digits is 79626240, while the sum is 59.

The spelling of 664464466140521 in words is "six hundred sixty-four trillion, four hundred sixty-four billion, four hundred sixty-six million, one hundred forty thousand, five hundred twenty-one".