664463574464 has 56 divisors (see below), whose sum is σ = 1337538874320. Its totient is φ = 327477510144.

The previous prime is 664463574449. The next prime is 664463574469. The reversal of 664463574464 is 464475364466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664463574469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1099607 + ... + 1593129.

Almost surely, 2^664463574464 is an apocalyptic number.

664463574464 is a gapful number since it is divisible by the number (64) 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 664463574464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (668769437160).

664463574464 is an abundant number, since it is smaller than the sum of its proper divisors (673075299856).

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

664463574464 is a wasteful number, since it uses less digits than its factorization.

664463574464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493837 (or 493827 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 59.

The spelling of 664463574464 in words is "six hundred sixty-four billion, four hundred sixty-three million, five hundred seventy-four thousand, four hundred sixty-four".