665519696 has 20 divisors (see below), whose sum is σ = 1298860692. Its totient is φ = 330329856.

The previous prime is 665519683. The next prime is 665519711. The reversal of 665519696 is 696915566.

It can be written as a sum of positive squares in 2 ways, for example, as 286828096 + 378691600 = 16936^2 + 19460^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149615 + ... + 153998.

Almost surely, 2^665519696 is an apocalyptic number.

It is an amenable number.

665519696 is a deficient number, since it is larger than the sum of its proper divisors (633340996).

665519696 is a wasteful number, since it uses less digits than its factorization.

665519696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303758 (or 303752 counting only the distinct ones).

The product of its digits is 2624400, while the sum is 53.

The square root of 665519696 is about 25797.6684217780. The cubic root of 665519696 is about 873.0791915695.

The spelling of 665519696 in words is "six hundred sixty-five million, five hundred nineteen thousand, six hundred ninety-six".