80000066 has 4 divisors (see below), whose sum is σ = 120000102. Its totient is φ = 40000032.

The previous prime is 80000059. The next prime is 80000069. The reversal of 80000066 is 66000008.

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., 68541841 + 11458225 = 8279^2 + 3385^2 .

It is not an unprimeable number, because it can be changed into a prime (80000069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20000015 + ... + 20000018.

Almost surely, 2^80000066 is an apocalyptic number.

80000066 is a deficient number, since it is larger than the sum of its proper divisors (40000036).

80000066 is a wasteful number, since it uses less digits than its factorization.

80000066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40000035.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 80000066 is about 8944.2755995106. The cubic root of 80000066 is about 430.8870565003.

The spelling of 80000066 in words is "eighty million, sixty-six", and thus it is an aban number and an uban number.