66948347 has 4 divisors (see below), whose sum is σ = 66989496. Its totient is φ = 66907200.

The previous prime is 66948317. The next prime is 66948353. The reversal of 66948347 is 74384966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74384966 = 2 ⋅37192483.

It is a cyclic number.

It is not a de Polignac number, because 66948347 - 2¹⁰ = 66947323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66948307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18029 + ... + 21422.

It is an arithmetic number, because the mean of its divisors is an integer number (16747374).

Almost surely, 2^66948347 is an apocalyptic number.

66948347 is a deficient number, since it is larger than the sum of its proper divisors (41149).

66948347 is a wasteful number, since it uses less digits than its factorization.

66948347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41148.

The product of its digits is 870912, while the sum is 47.

The square root of 66948347 is about 8182.1969543638. The cubic root of 66948347 is about 406.0504095076.

The spelling of 66948347 in words is "sixty-six million, nine hundred forty-eight thousand, three hundred forty-seven".