66630081 has 32 divisors (see below), whose sum is σ = 107907840. Its totient is φ = 35755776.

The previous prime is 66630079. The next prime is 66630097. The reversal of 66630081 is 18003666.

It is not a de Polignac number, because 66630081 - 2¹ = 66630079 is a prime.

It is a super-2 number, since 2×66630081² = 8879135388133122, which contains 22 as substring.

66630081 is a modest number, since divided by 30081 gives 666 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66630181) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21055 + ... + 24011.

It is an arithmetic number, because the mean of its divisors is an integer number (3372120).

Almost surely, 2^66630081 is an apocalyptic number.

It is an amenable number.

66630081 is a deficient number, since it is larger than the sum of its proper divisors (41277759).

66630081 is a wasteful number, since it uses less digits than its factorization.

66630081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3033.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 66630081 is about 8162.7250964369. The cubic root of 66630081 is about 405.4059456607.

The spelling of 66630081 in words is "sixty-six million, six hundred thirty thousand, eighty-one".