80018666 has 48 divisors (see below), whose sum is σ = 152028576. Its totient is φ = 31306464.

The previous prime is 80018663. The next prime is 80018681. The reversal of 80018666 is 66681008.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (80018663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136025 + ... + 136611.

It is an arithmetic number, because the mean of its divisors is an integer number (3167262).

Almost surely, 2^80018666 is an apocalyptic number.

80018666 is a deficient number, since it is larger than the sum of its proper divisors (72009910).

80018666 is a wasteful number, since it uses less digits than its factorization.

80018666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723 (or 716 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 80018666 is about 8945.3153102616. The cubic root of 80018666 is about 430.9204476319.

The spelling of 80018666 in words is "eighty million, eighteen thousand, six hundred sixty-six".