8503506666 has 24 divisors (see below), whose sum is σ = 18771894180. Its totient is φ = 2781020736.

The previous prime is 8503506653. The next prime is 8503506703. The reversal of 8503506666 is 6666053058.

It can be written as a sum of positive squares in 2 ways, for example, as 8231751441 + 271755225 = 90729^2 + 16485^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4455811 + ... + 4457718.

Almost surely, 2^8503506666 is an apocalyptic number.

8503506666 is an abundant number, since it is smaller than the sum of its proper divisors (10268387514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8503506666 is a wasteful number, since it uses less digits than its factorization.

8503506666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8913590 (or 8913587 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The square root of 8503506666 is about 92214.4601784341. The cubic root of 8503506666 is about 2041.1081594557.

The spelling of 8503506666 in words is "eight billion, five hundred three million, five hundred six thousand, six hundred sixty-six".