80807666 has 4 divisors (see below), whose sum is σ = 121211502. Its totient is φ = 40403832.

The previous prime is 80807663. The next prime is 80807677. The reversal of 80807666 is 66670808.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 78765625 + 2042041 = 8875^2 + 1429^2 .

It is not an unprimeable number, because it can be changed into a prime (80807663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20201915 + ... + 20201918.

Almost surely, 2^80807666 is an apocalyptic number.

80807666 is a deficient number, since it is larger than the sum of its proper divisors (40403836).

80807666 is a wasteful number, since it uses less digits than its factorization.

80807666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40403835.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 80807666 is about 8989.3084272373. The cubic root of 80807666 is about 432.3321384065.

The spelling of 80807666 in words is "eighty million, eight hundred seven thousand, six hundred sixty-six".