659965568 has 32 divisors (see below), whose sum is σ = 1392119460. Its totient is φ = 310571008.

The previous prime is 659965567. The next prime is 659965571. The reversal of 659965568 is 865569956.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 635443264 + 24522304 = 25208^2 + 4952^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (659965567) 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, 149471 + ... + 153822.

Almost surely, 2^659965568 is an apocalyptic number.

659965568 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

659965568 is an abundant number, since it is smaller than the sum of its proper divisors (732153892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

659965568 is a wasteful number, since it uses less digits than its factorization.

659965568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303324 (or 303312 counting only the distinct ones).

The product of its digits is 17496000, while the sum is 59.

The square root of 659965568 is about 25689.7950166988. The cubic root of 659965568 is about 870.6436281860.

The spelling of 659965568 in words is "six hundred fifty-nine million, nine hundred sixty-five thousand, five hundred sixty-eight".