664838641632 has 192 divisors, whose sum is σ = 1980071654400. Its totient is φ = 193539041280.

The previous prime is 664838641609. The next prime is 664838641657. The reversal of 664838641632 is 236146838466.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2978994 + ... + 3194382.

It is an arithmetic number, because the mean of its divisors is an integer number (10312873200).

Almost surely, 2^664838641632 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 664838641632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (990035827200).

664838641632 is an abundant number, since it is smaller than the sum of its proper divisors (1315233012768).

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

664838641632 is a wasteful number, since it uses less digits than its factorization.

664838641632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215529 (or 215521 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 57.

The spelling of 664838641632 in words is "six hundred sixty-four billion, eight hundred thirty-eight million, six hundred forty-one thousand, six hundred thirty-two".