664465472256 has 72 divisors (see below), whose sum is σ = 1769596433920. Its totient is φ = 221344551936.

The previous prime is 664465472219. The next prime is 664465472257. The reversal of 664465472256 is 652274564466.

It is a junction number, because it is equal to n+sod(n) for n = 664465472196 and 664465472205.

It is not an unprimeable number, because it can be changed into a prime (664465472257) 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 7 ways as a sum of consecutive naturals, for example, 904665 + ... + 1465383.

Almost surely, 2^664465472256 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 664465472256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (884798216960).

664465472256 is an abundant number, since it is smaller than the sum of its proper divisors (1105130961664).

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

664465472256 is a wasteful number, since it uses less digits than its factorization.

664465472256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562281 (or 562267 counting only the distinct ones).

The product of its digits is 58060800, while the sum is 57.

The spelling of 664465472256 in words is "six hundred sixty-four billion, four hundred sixty-five million, four hundred seventy-two thousand, two hundred fifty-six".