66667047 has 8 divisors (see below), whose sum is σ = 94118256. Its totient is φ = 41830272.

The previous prime is 66667039. The next prime is 66667049. The reversal of 66667047 is 74076666.

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

It is not a de Polignac number, because 66667047 - 2³ = 66667039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66667049) 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, 653548 + ... + 653649.

It is an arithmetic number, because the mean of its divisors is an integer number (11764782).

Almost surely, 2^66667047 is an apocalyptic number.

66667047 is a deficient number, since it is larger than the sum of its proper divisors (27451209).

66667047 is a wasteful number, since it uses less digits than its factorization.

66667047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307217.

The product of its (nonzero) digits is 254016, while the sum is 42.

The square root of 66667047 is about 8164.9890998090. The cubic root of 66667047 is about 405.4809041248.

The spelling of 66667047 in words is "sixty-six million, six hundred sixty-seven thousand, forty-seven".