666576505 has 32 divisors (see below), whose sum is σ = 930737664. Its totient is φ = 448851456.

The previous prime is 666576503. The next prime is 666576553. The reversal of 666576505 is 505675666.

It is a cyclic number.

It is not a de Polignac number, because 666576505 - 2¹ = 666576503 is a prime.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666576503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 809524 + ... + 810346.

It is an arithmetic number, because the mean of its divisors is an integer number (29085552).

Almost surely, 2^666576505 is an apocalyptic number.

It is an amenable number.

666576505 is a deficient number, since it is larger than the sum of its proper divisors (264161159).

666576505 is a wasteful number, since it uses less digits than its factorization.

666576505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225.

The product of its (nonzero) digits is 1134000, while the sum is 46.

The square root of 666576505 is about 25818.1429425123. The cubic root of 666576505 is about 873.5410812255.

The spelling of 666576505 in words is "six hundred sixty-six million, five hundred seventy-six thousand, five hundred five".