166431643 has 8 divisors (see below), whose sum is σ = 190395360. Its totient is φ = 142514880.

The previous prime is 166431641. The next prime is 166431647. The reversal of 166431643 is 346134661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166431643 - 2¹ = 166431641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166431599 and 166431608.

It is not an unprimeable number, because it can be changed into a prime (166431641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3778 + ... + 18631.

It is an arithmetic number, because the mean of its divisors is an integer number (23799420).

Almost surely, 2^166431643 is an apocalyptic number.

166431643 is a deficient number, since it is larger than the sum of its proper divisors (23963717).

166431643 is a wasteful number, since it uses less digits than its factorization.

166431643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23477.

The product of its digits is 31104, while the sum is 34.

The square root of 166431643 is about 12900.8388486951. The cubic root of 166431643 is about 550.0624094470.

The spelling of 166431643 in words is "one hundred sixty-six million, four hundred thirty-one thousand, six hundred forty-three".