665488465 has 4 divisors (see below), whose sum is σ = 798586164. Its totient is φ = 532390768.

The previous prime is 665488457. The next prime is 665488469. The reversal of 665488465 is 564884566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 564884566 = 2 ⋅282442283.

It can be written as a sum of positive squares in 2 ways, for example, as 338891281 + 326597184 = 18409^2 + 18072^2 .

It is a cyclic number.

It is not a de Polignac number, because 665488465 - 2³ = 665488457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665488469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66548842 + ... + 66548851.

It is an arithmetic number, because the mean of its divisors is an integer number (199646541).

Almost surely, 2^665488465 is an apocalyptic number.

It is an amenable number.

665488465 is a deficient number, since it is larger than the sum of its proper divisors (133097699).

665488465 is a wasteful number, since it uses less digits than its factorization.

665488465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133097698.

The product of its digits is 5529600, while the sum is 52.

The square root of 665488465 is about 25797.0631080362. The cubic root of 665488465 is about 873.0655342913.

The spelling of 665488465 in words is "six hundred sixty-five million, four hundred eighty-eight thousand, four hundred sixty-five".