664578666312 has 192 divisors, whose sum is σ = 1885061136000. Its totient is φ = 194953651200.

The previous prime is 664578666277. The next prime is 664578666319. The reversal of 664578666312 is 213666875466.

It is not an unprimeable number, because it can be changed into a prime (664578666319) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21366612 + ... + 21397692.

It is an arithmetic number, because the mean of its divisors is an integer number (9818026750).

Almost surely, 2^664578666312 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 664578666312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (942530568000).

664578666312 is an abundant number, since it is smaller than the sum of its proper divisors (1220482469688).

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

664578666312 is a wasteful number, since it uses less digits than its factorization.

664578666312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31348 (or 31333 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 60.

The spelling of 664578666312 in words is "six hundred sixty-four billion, five hundred seventy-eight million, six hundred sixty-six thousand, three hundred twelve".