660069897 has 16 divisors (see below), whose sum is σ = 949449600. Its totient is φ = 406345472.

The previous prime is 660069881. The next prime is 660069911. The reversal of 660069897 is 798960066.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 660069897 - 2⁴ = 660069881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (660069827) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 119397 + ... + 124802.

It is an arithmetic number, because the mean of its divisors is an integer number (59340600).

Almost surely, 2^660069897 is an apocalyptic number.

It is an amenable number.

660069897 is a deficient number, since it is larger than the sum of its proper divisors (289379703).

660069897 is a wasteful number, since it uses less digits than its factorization.

660069897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244272.

The product of its (nonzero) digits is 979776, while the sum is 51.

The square root of 660069897 is about 25691.8254898324. The cubic root of 660069897 is about 870.6895036061.

The spelling of 660069897 in words is "six hundred sixty million, sixty-nine thousand, eight hundred ninety-seven".