665606376 has 128 divisors (see below), whose sum is σ = 1946160000. Its totient is φ = 210470400.

The previous prime is 665606311. The next prime is 665606399. The reversal of 665606376 is 673606566.

It is a happy number.

665606376 is a `hidden beast` number, since 6 + 6 + 5 + 6 + 0 + 637 + 6 = 666.

665606376 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 368676 + ... + 370476.

It is an arithmetic number, because the mean of its divisors is an integer number (15204375).

Almost surely, 2^665606376 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 665606376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (973080000).

665606376 is an abundant number, since it is smaller than the sum of its proper divisors (1280553624).

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

665606376 is a wasteful number, since it uses less digits than its factorization.

665606376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904 (or 1894 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 45.

The square root of 665606376 is about 25799.3483638638. The cubic root of 665606376 is about 873.1170943891.

The spelling of 665606376 in words is "six hundred sixty-five million, six hundred six thousand, three hundred seventy-six".