665254465 has 4 divisors (see below), whose sum is σ = 798305364. Its totient is φ = 532203568.

The previous prime is 665254439. The next prime is 665254501. The reversal of 665254465 is 564452566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 522762496 + 142491969 = 22864^2 + 11937^2 .

It is a cyclic number.

It is not a de Polignac number, because 665254465 - 2¹⁹ = 664730177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66525442 + ... + 66525451.

It is an arithmetic number, because the mean of its divisors is an integer number (199576341).

Almost surely, 2^665254465 is an apocalyptic number.

It is an amenable number.

665254465 is a deficient number, since it is larger than the sum of its proper divisors (133050899).

665254465 is a wasteful number, since it uses less digits than its factorization.

665254465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133050898.

The product of its digits is 864000, while the sum is 43.

The square root of 665254465 is about 25792.5273092809. The cubic root of 665254465 is about 872.9631927805.

The spelling of 665254465 in words is "six hundred sixty-five million, two hundred fifty-four thousand, four hundred sixty-five".