16000066 has 4 divisors (see below), whose sum is σ = 24000102. Its totient is φ = 8000032.

The previous prime is 16000057. The next prime is 16000079. The reversal of 16000066 is 66000061.

It is a happy number.

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., 15405625 + 594441 = 3925^2 + 771^2 .

It is a super-2 number, since 2×16000066² = 512004224008712, which contains 22 as substring.

16000066 is a modest number, since divided by 66 gives 16 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4000015 + ... + 4000018.

Almost surely, 2^16000066 is an apocalyptic number.

16000066 is a deficient number, since it is larger than the sum of its proper divisors (8000036).

16000066 is an equidigital number, since it uses as much as digits as its factorization.

16000066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8000035.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 16000066 is about 4000.0082499915. The cubic root of 16000066 is about 251.9845564568.

The spelling of 16000066 in words is "sixteen million, sixty-six", and thus it is an aban number and an uban number.