66116847 has 4 divisors (see below), whose sum is σ = 88155800. Its totient is φ = 44077896.

The previous prime is 66116837. The next prime is 66116857. The reversal of 66116847 is 74861166.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (66116837) and next prime (66116857).

It is not a de Polignac number, because 66116847 - 2⁶ = 66116783 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 (66116837) 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, 11019472 + ... + 11019477.

It is an arithmetic number, because the mean of its divisors is an integer number (22038950).

Almost surely, 2^66116847 is an apocalyptic number.

66116847 is a deficient number, since it is larger than the sum of its proper divisors (22038953).

66116847 is a wasteful number, since it uses less digits than its factorization.

66116847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22038952.

The product of its digits is 48384, while the sum is 39.

The square root of 66116847 is about 8131.2266602278. The cubic root of 66116847 is about 404.3623497289.

The spelling of 66116847 in words is "sixty-six million, one hundred sixteen thousand, eight hundred forty-seven".