66668047 has 4 divisors (see below), whose sum is σ = 66684400. Its totient is φ = 66651696.

The previous prime is 66668029. The next prime is 66668051. The reversal of 66668047 is 74086666.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 66668047 - 2⁷ = 66667919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66667994 and 66668012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66668027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3454 + ... + 12052.

It is an arithmetic number, because the mean of its divisors is an integer number (16671100).

Almost surely, 2^66668047 is an apocalyptic number.

66668047 is a deficient number, since it is larger than the sum of its proper divisors (16353).

66668047 is an equidigital number, since it uses as much as digits as its factorization.

66668047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16352.

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 66668047 is about 8165.0503366483. The cubic root of 66668047 is about 405.4829315076.

The spelling of 66668047 in words is "sixty-six million, six hundred sixty-eight thousand, forty-seven".