166649543423 has 32 divisors (see below), whose sum is σ = 193355382528. Its totient is φ = 141950707200.

The previous prime is 166649543407. The next prime is 166649543443. The reversal of 166649543423 is 324345946661.

It is not a de Polignac number, because 166649543423 - 2⁴ = 166649543407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166649543443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75032453 + ... + 75034673.

It is an arithmetic number, because the mean of its divisors is an integer number (6042355704).

Almost surely, 2^166649543423 is an apocalyptic number.

166649543423 is a deficient number, since it is larger than the sum of its proper divisors (26705839105).

166649543423 is a wasteful number, since it uses less digits than its factorization.

166649543423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3863.

The product of its digits is 11197440, while the sum is 53.

The spelling of 166649543423 in words is "one hundred sixty-six billion, six hundred forty-nine million, five hundred forty-three thousand, four hundred twenty-three".