664715454720 has 288 divisors, whose sum is σ = 2207947768320. Its totient is φ = 170280714240.

The previous prime is 664715454709. The next prime is 664715454731. The reversal of 664715454720 is 27454517466.

It is an interprime number because it is at equal distance from previous prime (664715454709) and next prime (664715454731).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11194710 + ... + 11253930.

Almost surely, 2^664715454720 is an apocalyptic number.

664715454720 is a gapful number since it is divisible by the number (60) 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 664715454720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1103973884160).

664715454720 is an abundant number, since it is smaller than the sum of its proper divisors (1543232313600).

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

664715454720 is a wasteful number, since it uses less digits than its factorization.

664715454720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59361 (or 59347 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 51.

The spelling of 664715454720 in words is "six hundred sixty-four billion, seven hundred fifteen million, four hundred fifty-four thousand, seven hundred twenty".