665650325 has 6 divisors (see below), whose sum is σ = 825406434. Its totient is φ = 532520240.

The previous prime is 665650309. The next prime is 665650333. The reversal of 665650325 is 523056566.

It can be written as a sum of positive squares in 3 ways, for example, as 133240849 + 532409476 = 11543^2 + 23074^2 .

It is not a de Polignac number, because 665650325 - 2⁴ = 665650309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13312982 + ... + 13313031.

It is an arithmetic number, because the mean of its divisors is an integer number (137567739).

Almost surely, 2^665650325 is an apocalyptic number.

It is an amenable number.

665650325 is a deficient number, since it is larger than the sum of its proper divisors (159756109).

665650325 is a wasteful number, since it uses less digits than its factorization.

665650325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26626023 (or 26626018 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 38.

The square root of 665650325 is about 25800.2000961233. The cubic root of 665650325 is about 873.1363108410.

The spelling of 665650325 in words is "six hundred sixty-five million, six hundred fifty thousand, three hundred twenty-five".