666165598 has 16 divisors (see below), whose sum is σ = 1147981824. Its totient is φ = 284003640.

The previous prime is 666165571. The next prime is 666165607. The reversal of 666165598 is 895561666.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 121890 + ... + 127237.

It is an arithmetic number, because the mean of its divisors is an integer number (71748864).

Almost surely, 2^666165598 is an apocalyptic number.

666165598 is a deficient number, since it is larger than the sum of its proper divisors (481816226).

666165598 is a wasteful number, since it uses less digits than its factorization.

666165598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249327.

The product of its digits is 2332800, while the sum is 52.

The square root of 666165598 is about 25810.1839977944. The cubic root of 666165598 is about 873.3615479816.

The spelling of 666165598 in words is "six hundred sixty-six million, one hundred sixty-five thousand, five hundred ninety-eight".