664557834832 has 80 divisors (see below), whose sum is σ = 1350889251840. Its totient is φ = 316270918656.

The previous prime is 664557834791. The next prime is 664557834893. The reversal of 664557834832 is 238438755466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99139993 + ... + 99146695.

It is an arithmetic number, because the mean of its divisors is an integer number (16886115648).

Almost surely, 2^664557834832 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664557834832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (675444625920).

664557834832 is an abundant number, since it is smaller than the sum of its proper divisors (686331417008).

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

664557834832 is a wasteful number, since it uses less digits than its factorization.

664557834832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9740 (or 9734 counting only the distinct ones).

The product of its digits is 116121600, while the sum is 61.

The spelling of 664557834832 in words is "six hundred sixty-four billion, five hundred fifty-seven million, eight hundred thirty-four thousand, eight hundred thirty-two".