665550608 has 10 divisors (see below), whose sum is σ = 1289504334. Its totient is φ = 332775296.

The previous prime is 665550583. The next prime is 665550617. The reversal of 665550608 is 806055566.

It can be written as a sum of positive squares in only one way, i.e., 661106944 + 4443664 = 25712^2 + 2108^2 .

It is a super-2 number, since 2×665550608² = 885915223618339328, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20798441 + ... + 20798472.

Almost surely, 2^665550608 is an apocalyptic number.

It is an amenable number.

665550608 is a deficient number, since it is larger than the sum of its proper divisors (623953726).

665550608 is a wasteful number, since it uses less digits than its factorization.

665550608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41596921 (or 41596915 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 41.

The square root of 665550608 is about 25798.2675387321. The cubic root of 665550608 is about 873.0927089286.

The spelling of 665550608 in words is "six hundred sixty-five million, five hundred fifty thousand, six hundred eight".