166723216623663 has 16 divisors (see below), whose sum is σ = 258847905056256. Its totient is φ = 93472854602400.

The previous prime is 166723216623659. The next prime is 166723216623701. The reversal of 166723216623663 is 366326612327661.

It is not a de Polignac number, because 166723216623663 - 2² = 166723216623659 is a prime.

It is a super-2 number, since 2×166723216623663² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166723216623597 and 166723216623606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166723216623643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74898119563 + ... + 74898121788.

It is an arithmetic number, because the mean of its divisors is an integer number (16177994066016).

Almost surely, 2^{166723216623663} is an apocalyptic number.

166723216623663 is a deficient number, since it is larger than the sum of its proper divisors (92124688432593).

166723216623663 is a wasteful number, since it uses less digits than its factorization.

166723216623663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149796241414.

The product of its digits is 70543872, while the sum is 60.

The spelling of 166723216623663 in words is "one hundred sixty-six trillion, seven hundred twenty-three billion, two hundred sixteen million, six hundred twenty-three thousand, six hundred sixty-three".