665770752 has 180 divisors, whose sum is σ = 2011733416. Its totient is φ = 218972160.

The previous prime is 665770741. The next prime is 665770753. The reversal of 665770752 is 257077566.

665770752 is a `hidden beast` number, since 6 + 6 + 577 + 0 + 75 + 2 = 666.

665770752 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 665770698 and 665770707.

It is not an unprimeable number, because it can be changed into a prime (665770753) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2011227 + ... + 2011557.

Almost surely, 2^665770752 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 665770752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1005866708).

665770752 is an abundant number, since it is smaller than the sum of its proper divisors (1345962664).

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

665770752 is an equidigital number, since it uses as much as digits as its factorization.

665770752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456 (or 433 counting only the distinct ones).

The product of its (nonzero) digits is 617400, while the sum is 45.

The square root of 665770752 is about 25802.5338290642. The cubic root of 665770752 is about 873.1889625322.

The spelling of 665770752 in words is "six hundred sixty-five million, seven hundred seventy thousand, seven hundred fifty-two".