664444187238000 has 960 divisors, whose sum is σ = 2426462058488832. Its totient is φ = 155205779097600.

The previous prime is 664444187237933. The next prime is 664444187238017. The reversal of 664444187238000 is 832781444466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 28935414519 + ... + 28935437481.

Almost surely, 2^{664444187238000} is an apocalyptic number.

664444187238000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664444187238000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1213231029244416).

664444187238000 is an abundant number, since it is smaller than the sum of its proper divisors (1762017871250832).

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

664444187238000 is a wasteful number, since it uses less digits than its factorization.

664444187238000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23279 (or 23136 counting only the distinct ones).

The product of its (nonzero) digits is 24772608, while the sum is 57.

The spelling of 664444187238000 in words is "six hundred sixty-four trillion, four hundred forty-four billion, one hundred eighty-seven million, two hundred thirty-eight thousand".