664175614720 has 144 divisors (see below), whose sum is σ = 1680085193472. Its totient is φ = 251056762880.

The previous prime is 664175614703. The next prime is 664175614723. The reversal of 664175614720 is 27416571466.

It is a super-2 number, since 2×664175614720² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664175614723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2307615 + ... + 2579425.

It is an arithmetic number, because the mean of its divisors is an integer number (11667258288).

Almost surely, 2^664175614720 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 664175614720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (840042596736).

664175614720 is an abundant number, since it is smaller than the sum of its proper divisors (1015909578752).

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

664175614720 is a wasteful number, since it uses less digits than its factorization.

664175614720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271938 (or 271924 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 664175614720 in words is "six hundred sixty-four billion, one hundred seventy-five million, six hundred fourteen thousand, seven hundred twenty".