66865667 has 8 divisors (see below), whose sum is σ = 75297792. Its totient is φ = 58825800.

The previous prime is 66865651. The next prime is 66865681. The reversal of 66865667 is 76656866.

66865667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 66865667 - 2⁴ = 66865651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66865637) 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 7 ways as a sum of consecutive naturals, for example, 97703 + ... + 98384.

It is an arithmetic number, because the mean of its divisors is an integer number (9412224).

Almost surely, 2^66865667 is an apocalyptic number.

66865667 is a deficient number, since it is larger than the sum of its proper divisors (8432125).

66865667 is a wasteful number, since it uses less digits than its factorization.

66865667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196129.

The product of its digits is 2177280, while the sum is 50.

The square root of 66865667 is about 8177.1429607168. The cubic root of 66865667 is about 405.8831856740.

The spelling of 66865667 in words is "sixty-six million, eight hundred sixty-five thousand, six hundred sixty-seven".