66668847 has 8 divisors (see below), whose sum is σ = 101590656. Its totient is φ = 38096472.

The previous prime is 66668843. The next prime is 66668873. The reversal of 66668847 is 74886666.

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

It is not a de Polignac number, because 66668847 - 2² = 66668843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66668847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66668843) 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, 1587333 + ... + 1587374.

It is an arithmetic number, because the mean of its divisors is an integer number (12698832).

Almost surely, 2^66668847 is an apocalyptic number.

66668847 is a deficient number, since it is larger than the sum of its proper divisors (34921809).

66668847 is a wasteful number, since it uses less digits than its factorization.

66668847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174717.

The product of its digits is 2322432, while the sum is 51.

The square root of 66668847 is about 8165.0993257890. The cubic root of 66668847 is about 405.4845533993.

The spelling of 66668847 in words is "sixty-six million, six hundred sixty-eight thousand, eight hundred forty-seven".