664710364840 has 64 divisors (see below), whose sum is σ = 1529678649600. Its totient is φ = 259842156288.

The previous prime is 664710364753. The next prime is 664710364853. The reversal of 664710364840 is 48463017466.

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, 1011631 + ... + 1533889.

It is an arithmetic number, because the mean of its divisors is an integer number (23901228900).

Almost surely, 2^664710364840 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 664710364840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (764839324800).

664710364840 is an abundant number, since it is smaller than the sum of its proper divisors (864968284760).

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

664710364840 is a wasteful number, since it uses less digits than its factorization.

664710364840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522994 (or 522990 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 49.

The spelling of 664710364840 in words is "six hundred sixty-four billion, seven hundred ten million, three hundred sixty-four thousand, eight hundred forty".