665020263456 has 96 divisors (see below), whose sum is σ = 1942109023680. Its totient is φ = 221391525888.

The previous prime is 665020263407. The next prime is 665020263461. The reversal of 665020263456 is 654362020566.

665020263456 is a `hidden beast` number, since 6 + 6 + 5 + 0 + 2 + 0 + 2 + 634 + 5 + 6 = 666.

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

It is an unprimeable number.

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, 190960 + ... + 1168976.

It is an arithmetic number, because the mean of its divisors is an integer number (20230302330).

Almost surely, 2^665020263456 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 665020263456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (971054511840).

665020263456 is an abundant number, since it is smaller than the sum of its proper divisors (1277088760224).

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

665020263456 is a wasteful number, since it uses less digits than its factorization.

665020263456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978823 (or 978809 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 45.

The spelling of 665020263456 in words is "six hundred sixty-five billion, twenty million, two hundred sixty-three thousand, four hundred fifty-six".