660555065 has 8 divisors (see below), whose sum is σ = 794706120. Its totient is φ = 527084032.

The previous prime is 660555053. The next prime is 660555073. The reversal of 660555065 is 560555066.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 28334329 + 632220736 = 5323^2 + 25144^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660555065 - 2²⁶ = 593446201 is a prime.

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, 167864 + ... + 171753.

It is an arithmetic number, because the mean of its divisors is an integer number (99338265).

Almost surely, 2^660555065 is an apocalyptic number.

It is an amenable number.

660555065 is a deficient number, since it is larger than the sum of its proper divisors (134151055).

660555065 is a wasteful number, since it uses less digits than its factorization.

660555065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340011.

The product of its (nonzero) digits is 135000, while the sum is 38.

The square root of 660555065 is about 25701.2658248577. The cubic root of 660555065 is about 870.9027775994.

Subtracting from 660555065 its reverse (560555066), we obtain a palindrome (99999999).

The spelling of 660555065 in words is "six hundred sixty million, five hundred fifty-five thousand, sixty-five".