665606425 has 48 divisors (see below), whose sum is σ = 937082880. Its totient is φ = 464616000.

The previous prime is 665606419. The next prime is 665606437. The reversal of 665606425 is 524606566.

665606425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665606425 - 2⁷ = 665606297 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1389336 + ... + 1389814.

It is an arithmetic number, because the mean of its divisors is an integer number (19522560).

Almost surely, 2^665606425 is an apocalyptic number.

It is an amenable number.

665606425 is a deficient number, since it is larger than the sum of its proper divisors (271476455).

665606425 is a wasteful number, since it uses less digits than its factorization.

665606425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694 (or 689 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 665606425 is about 25799.3493135001. The cubic root of 665606425 is about 873.1171158146.

The spelling of 665606425 in words is "six hundred sixty-five million, six hundred six thousand, four hundred twenty-five".