166728313871867 has 4 divisors (see below), whose sum is σ = 181885433314776. Its totient is φ = 151571194428960.

The previous prime is 166728313871851. The next prime is 166728313871881. The reversal of 166728313871867 is 768178313827661.

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

It is a cyclic number.

It is not a de Polignac number, because 166728313871867 - 2⁴ = 166728313871851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166728313871794 and 166728313871803.

It is not an unprimeable number, because it can be changed into a prime (166728313871827) 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, 7578559721438 + ... + 7578559721459.

It is an arithmetic number, because the mean of its divisors is an integer number (45471358328694).

Almost surely, 2^{166728313871867} is an apocalyptic number.

166728313871867 is a deficient number, since it is larger than the sum of its proper divisors (15157119442909).

166728313871867 is a wasteful number, since it uses less digits than its factorization.

166728313871867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15157119442908.

The product of its digits is 682795008, while the sum is 74.

The spelling of 166728313871867 in words is "one hundred sixty-six trillion, seven hundred twenty-eight billion, three hundred thirteen million, eight hundred seventy-one thousand, eight hundred sixty-seven".