66936081 has 8 divisors (see below), whose sum is σ = 89315424. Its totient is φ = 44590400.

The previous prime is 66936073. The next prime is 66936083. The reversal of 66936081 is 18063966.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66936081 - 2³ = 66936073 is a prime.

It is a super-2 number, since 2×66936081² = 8960877879277122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66936083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3336 + ... + 12041.

It is an arithmetic number, because the mean of its divisors is an integer number (11164428).

Almost surely, 2^66936081 is an apocalyptic number.

It is an amenable number.

66936081 is a deficient number, since it is larger than the sum of its proper divisors (22379343).

66936081 is a wasteful number, since it uses less digits than its factorization.

66936081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16831.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 66936081 is about 8181.4473658394. The cubic root of 66936081 is about 406.0256096992.

The spelling of 66936081 in words is "sixty-six million, nine hundred thirty-six thousand, eighty-one".