166216784247 has 12 divisors (see below), whose sum is σ = 240910337304. Its totient is φ = 110432992560.

The previous prime is 166216784197. The next prime is 166216784267. The reversal of 166216784247 is 742487612661.

166216784247 is a `hidden beast` number, since 1 + 6 + 621 + 6 + 7 + 8 + 4 + 2 + 4 + 7 = 666.

It is not a de Polignac number, because 166216784247 - 2¹⁰ = 166216783223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166216784193 and 166216784202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166216784267) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31513629 + ... + 31518902.

It is an arithmetic number, because the mean of its divisors is an integer number (20075861442).

Almost surely, 2^166216784247 is an apocalyptic number.

166216784247 is a deficient number, since it is larger than the sum of its proper divisors (74693553057).

166216784247 is a wasteful number, since it uses less digits than its factorization.

166216784247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63032830 (or 63032827 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 54.

The spelling of 166216784247 in words is "one hundred sixty-six billion, two hundred sixteen million, seven hundred eighty-four thousand, two hundred forty-seven".