660128297 has 4 divisors (see below), whose sum is σ = 660182016. Its totient is φ = 660074580.

The previous prime is 660128263. The next prime is 660128311. The reversal of 660128297 is 792821066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 660128297 - 2⁶ = 660128233 is a prime.

It is a super-3 number, since 3×660128297³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660128237) by changing a digit.

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, 1688 + ... + 36374.

It is an arithmetic number, because the mean of its divisors is an integer number (165045504).

Almost surely, 2^660128297 is an apocalyptic number.

It is an amenable number.

660128297 is a deficient number, since it is larger than the sum of its proper divisors (53719).

660128297 is a wasteful number, since it uses less digits than its factorization.

660128297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53718.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 660128297 is about 25692.9620129716. The cubic root of 660128297 is about 870.7151810724.

The spelling of 660128297 in words is "six hundred sixty million, one hundred twenty-eight thousand, two hundred ninety-seven".