666364505 has 8 divisors (see below), whose sum is σ = 805005000. Its totient is φ = 529513216.

The previous prime is 666364493. The next prime is 666364519. The reversal of 666364505 is 505463666.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2374681 + 663989824 = 1541^2 + 25768^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666364505 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 446480 + ... + 447969.

It is an arithmetic number, because the mean of its divisors is an integer number (100625625).

Almost surely, 2^666364505 is an apocalyptic number.

It is an amenable number.

666364505 is a deficient number, since it is larger than the sum of its proper divisors (138640495).

666364505 is a wasteful number, since it uses less digits than its factorization.

666364505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894603.

The product of its (nonzero) digits is 388800, while the sum is 41.

The square root of 666364505 is about 25814.0369760330. The cubic root of 666364505 is about 873.4484635268.

The spelling of 666364505 in words is "six hundred sixty-six million, three hundred sixty-four thousand, five hundred five".