8649581666 has 48 divisors (see below), whose sum is σ = 14626114272. Its totient is φ = 3831421440.

The previous prime is 8649581651. The next prime is 8649581683. The reversal of 8649581666 is 6661859468.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7106690 + ... + 7107906.

It is an arithmetic number, because the mean of its divisors is an integer number (304710714).

Almost surely, 2^8649581666 is an apocalyptic number.

8649581666 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

8649581666 is a deficient number, since it is larger than the sum of its proper divisors (5976532606).

8649581666 is a wasteful number, since it uses less digits than its factorization.

8649581666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967 (or 1956 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 59.

The square root of 8649581666 is about 93003.1271839824. The cubic root of 8649581666 is about 2052.7293936696.

The spelling of 8649581666 in words is "eight billion, six hundred forty-nine million, five hundred eighty-one thousand, six hundred sixty-six".