664774000000 has 672 divisors, whose sum is σ = 1891796878440. Its totient is φ = 232320000000.

The previous prime is 664773999979. The next prime is 664774000001. The reversal of 664774000000 is 477466.

664774000000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 664774000000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664774000001) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 9921999967 + ... + 9922000033.

Almost surely, 2^664774000000 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 664774000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (945898439220).

664774000000 is an abundant number, since it is smaller than the sum of its proper divisors (1227022878440).

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

664774000000 is an frugal number, since it uses more digits than its factorization.

664774000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 34.

Adding to 664774000000 its reverse (477466), we get a palindrome (664774477466).

The spelling of 664774000000 in words is "six hundred sixty-four billion, seven hundred seventy-four million", and thus it is an aban number.