664865883430 has 64 divisors (see below), whose sum is σ = 1394464232448. Its totient is φ = 223503096960.

The previous prime is 664865883403. The next prime is 664865883449. The reversal of 664865883430 is 34388568466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5546509 + ... + 5665111.

It is an arithmetic number, because the mean of its divisors is an integer number (21788503632).

Almost surely, 2^664865883430 is an apocalyptic number.

664865883430 is an abundant number, since it is smaller than the sum of its proper divisors (729598349018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664865883430 is a wasteful number, since it uses less digits than its factorization.

664865883430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120181.

The product of its (nonzero) digits is 79626240, while the sum is 61.

The spelling of 664865883430 in words is "six hundred sixty-four billion, eight hundred sixty-five million, eight hundred eighty-three thousand, four hundred thirty".