66667081 has 32 divisors (see below), whose sum is σ = 80898048. Its totient is φ = 54328320.

The previous prime is 66667063. The next prime is 66667091. The reversal of 66667081 is 18076666.

66667081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66667081 - 2⁵ = 66667049 is a prime.

It is a super-2 number, since 2×66667081² = 8888999378121122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66667091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 253356 + ... + 253618.

It is an arithmetic number, because the mean of its divisors is an integer number (2528064).

Almost surely, 2^66667081 is an apocalyptic number.

It is an amenable number.

66667081 is a deficient number, since it is larger than the sum of its proper divisors (14230967).

66667081 is a wasteful number, since it uses less digits than its factorization.

66667081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 66667081 is about 8164.9911818691. The cubic root of 66667081 is about 405.4809730562.

The spelling of 66667081 in words is "sixty-six million, six hundred sixty-seven thousand, eighty-one".