665329676448 has 96 divisors (see below), whose sum is σ = 1844908531200. Its totient is φ = 209361528576.

The previous prime is 665329676371. The next prime is 665329676449. The reversal of 665329676448 is 844676923566.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (66) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (665329676449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128268 + ... + 1160651.

It is an arithmetic number, because the mean of its divisors is an integer number (19217797200).

Almost surely, 2^665329676448 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 665329676448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (922454265600).

665329676448 is an abundant number, since it is smaller than the sum of its proper divisors (1179578854752).

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

665329676448 is a wasteful number, since it uses less digits than its factorization.

665329676448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289234 (or 1289226 counting only the distinct ones).

The product of its digits is 313528320, while the sum is 66.

The spelling of 665329676448 in words is "six hundred sixty-five billion, three hundred twenty-nine million, six hundred seventy-six thousand, four hundred forty-eight".