664512063665 has 8 divisors (see below), whose sum is σ = 832084671168. Its totient is φ = 508496187760.

The previous prime is 664512063643. The next prime is 664512063667. The reversal of 664512063665 is 566360215466.

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

It is not a de Polignac number, because 664512063665 - 2²⁰ = 664511015089 is a prime.

It is a super-3 number, since 3×664512063665³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664512063667) 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, 2889182771 + ... + 2889183000.

It is an arithmetic number, because the mean of its divisors is an integer number (104010583896).

Almost surely, 2^664512063665 is an apocalyptic number.

It is an amenable number.

664512063665 is a deficient number, since it is larger than the sum of its proper divisors (167572607503).

664512063665 is a wasteful number, since it uses less digits than its factorization.

664512063665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5778365799.

The product of its (nonzero) digits is 4665600, while the sum is 50.

The spelling of 664512063665 in words is "six hundred sixty-four billion, five hundred twelve million, sixty-three thousand, six hundred sixty-five".