66006699 has 16 divisors (see below), whose sum is σ = 101658240. Its totient is φ = 37650560.

The previous prime is 66006671. The next prime is 66006701. The reversal of 66006699 is 99660066.

It is a cyclic number.

It is not a de Polignac number, because 66006699 - 2⁵ = 66006667 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 66006699.

It is not an unprimeable number, because it can be changed into a prime (66006649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58269 + ... + 59390.

It is an arithmetic number, because the mean of its divisors is an integer number (6353640).

Almost surely, 2^66006699 is an apocalyptic number.

66006699 is a deficient number, since it is larger than the sum of its proper divisors (35651541).

66006699 is a wasteful number, since it uses less digits than its factorization.

66006699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117690.

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 66006699 is about 8124.4506891235. The cubic root of 66006699 is about 404.1376744617.

The spelling of 66006699 in words is "sixty-six million, six thousand, six hundred ninety-nine".