664666450575 has 24 divisors (see below), whose sum is σ = 1112155150848. Its totient is φ = 350217821280.

The previous prime is 664666450561. The next prime is 664666450577. The reversal of 664666450575 is 575054666466.

It is not a de Polignac number, because 664666450575 - 2¹⁶ = 664666385039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664666450577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53380639 + ... + 53393088.

It is an arithmetic number, because the mean of its divisors is an integer number (46339797952).

Almost surely, 2^664666450575 is an apocalyptic number.

664666450575 is a deficient number, since it is larger than the sum of its proper divisors (447488700273).

664666450575 is a wasteful number, since it uses less digits than its factorization.

664666450575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106773823 (or 106773818 counting only the distinct ones).

The product of its (nonzero) digits is 108864000, while the sum is 60.

The spelling of 664666450575 in words is "six hundred sixty-four billion, six hundred sixty-six million, four hundred fifty thousand, five hundred seventy-five".