664466442260 has 48 divisors (see below), whose sum is σ = 1444677897600. Its totient is φ = 256411419264.

The previous prime is 664466442259. The next prime is 664466442331. The reversal of 664466442260 is 62244664466.

It is a junction number, because it is equal to n+sod(n) for n = 664466442199 and 664466442208.

It is a congruent number.

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, 240971 + ... + 1177709.

It is an arithmetic number, because the mean of its divisors is an integer number (30097456200).

Almost surely, 2^664466442260 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 664466442260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (722338948800).

664466442260 is an abundant number, since it is smaller than the sum of its proper divisors (780211455340).

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

664466442260 is a wasteful number, since it uses less digits than its factorization.

664466442260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938000 (or 937998 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 50.

The spelling of 664466442260 in words is "six hundred sixty-four billion, four hundred sixty-six million, four hundred forty-two thousand, two hundred sixty".