166142389 has 6 divisors (see below), whose sum is σ = 193267734. Its totient is φ = 142407720.

The previous prime is 166142387. The next prime is 166142393. The reversal of 166142389 is 983241661.

It can be written as a sum of positive squares in only one way, i.e., 157703364 + 8439025 = 12558^2 + 2905^2 .

It is not a de Polignac number, because 166142389 - 2¹ = 166142387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166142381) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1695282 + ... + 1695379.

It is an arithmetic number, because the mean of its divisors is an integer number (32211289).

Almost surely, 2^166142389 is an apocalyptic number.

It is an amenable number.

166142389 is a deficient number, since it is larger than the sum of its proper divisors (27125345).

166142389 is an equidigital number, since it uses as much as digits as its factorization.

166142389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3390675 (or 3390668 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 166142389 is about 12889.6233071413. The cubic root of 166142389 is about 549.7435597909.

The spelling of 166142389 in words is "one hundred sixty-six million, one hundred forty-two thousand, three hundred eighty-nine".