664433312015 has 8 divisors (see below), whose sum is σ = 869803608528. Its totient is φ = 483224226880.

The previous prime is 664433311967. The next prime is 664433312021. The reversal of 664433312015 is 510213334466.

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

It is not a de Polignac number, because 664433312015 - 2¹⁰ = 664433310991 is a prime.

It is a super-4 number, since 4×664433312015⁴ (a number of 48 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664433312015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6040302782 + ... + 6040302891.

It is an arithmetic number, because the mean of its divisors is an integer number (108725451066).

Almost surely, 2^664433312015 is an apocalyptic number.

664433312015 is a deficient number, since it is larger than the sum of its proper divisors (205370296513).

664433312015 is a wasteful number, since it uses less digits than its factorization.

664433312015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12080605689.

The product of its (nonzero) digits is 155520, while the sum is 38.

The spelling of 664433312015 in words is "six hundred sixty-four billion, four hundred thirty-three million, three hundred twelve thousand, fifteen".