66679847 has 8 divisors (see below), whose sum is σ = 71948016. Its totient is φ = 61431552.

The previous prime is 66679843. The next prime is 66679849. The reversal of 66679847 is 74897666.

It is a happy number.

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

It is not a de Polignac number, because 66679847 - 2² = 66679843 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66679843) 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, 2423 + ... + 11799.

It is an arithmetic number, because the mean of its divisors is an integer number (8993502).

Almost surely, 2^66679847 is an apocalyptic number.

66679847 is a deficient number, since it is larger than the sum of its proper divisors (5268169).

66679847 is a wasteful number, since it uses less digits than its factorization.

66679847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9937.

The product of its digits is 3048192, while the sum is 53.

The square root of 66679847 is about 8165.7728966706. The cubic root of 66679847 is about 405.5068530940.

The spelling of 66679847 in words is "sixty-six million, six hundred seventy-nine thousand, eight hundred forty-seven".