166643520323 has 16 divisors (see below), whose sum is σ = 208606207680. Its totient is φ = 129799412736.

The previous prime is 166643520317. The next prime is 166643520383. The reversal of 166643520323 is 323025346661.

166643520323 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166643520323 - 2⁶ = 166643520259 is a prime.

It is a super-2 number, since 2×166643520323² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166643520313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24140786 + ... + 24147687.

It is an arithmetic number, because the mean of its divisors is an integer number (13037887980).

Almost surely, 2^166643520323 is an apocalyptic number.

166643520323 is a deficient number, since it is larger than the sum of its proper divisors (41962687357).

166643520323 is a wasteful number, since it uses less digits than its factorization.

166643520323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48288526.

The product of its (nonzero) digits is 466560, while the sum is 41.

Adding to 166643520323 its reverse (323025346661), we get a palindrome (489668866984).

The spelling of 166643520323 in words is "one hundred sixty-six billion, six hundred forty-three million, five hundred twenty thousand, three hundred twenty-three".