665382025 has 81 divisors (see below), whose sum is σ = 1070945127. Its totient is φ = 408592800.

The previous prime is 665381963. The next prime is 665382031. The reversal of 665382025 is 520283566.

It is a happy number.

The square root of 665382025 is 25795.

It is a perfect power (a square), and thus also a powerful number.

665382025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 239537529 + 425844496 = 15477^2 + 20636^2 .

It is not a de Polignac number, because 665382025 - 2¹³ = 665373833 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 9931042 + ... + 9931108.

Almost surely, 2^665382025 is an apocalyptic number.

665382025 is the 25795-th square number.

665382025 is the 12898-th centered octagonal number.

It is an amenable number.

665382025 is a deficient number, since it is larger than the sum of its proper divisors (405563102).

665382025 is a wasteful number, since it uses less digits than its factorization.

665382025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The cubic root of 665382025 is about 873.0189849995.

The spelling of 665382025 in words is "six hundred sixty-five million, three hundred eighty-two thousand, twenty-five".