66116947 has 8 divisors (see below), whose sum is σ = 71598800. Its totient is φ = 60691680.

The previous prime is 66116933. The next prime is 66116951. The reversal of 66116947 is 74961166.

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

It is a cyclic number.

It is not a de Polignac number, because 66116947 - 2⁷ = 66116819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66116957) 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, 11697 + ... + 16402.

It is an arithmetic number, because the mean of its divisors is an integer number (8949850).

Almost surely, 2^66116947 is an apocalyptic number.

66116947 is a deficient number, since it is larger than the sum of its proper divisors (5481853).

66116947 is a wasteful number, since it uses less digits than its factorization.

66116947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28293.

The product of its digits is 54432, while the sum is 40.

The square root of 66116947 is about 8131.2328093592. The cubic root of 66116947 is about 404.3625535913.

The spelling of 66116947 in words is "sixty-six million, one hundred sixteen thousand, nine hundred forty-seven".