166989455 has 4 divisors (see below), whose sum is σ = 200387352. Its totient is φ = 133591560.

The previous prime is 166989397. The next prime is 166989463. The reversal of 166989455 is 554989661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 554989661 = 1549 ⋅358289.

It is not a de Polignac number, because 166989455 - 2¹⁴ = 166973071 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166989397 and 166989406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16698941 + ... + 16698950.

It is an arithmetic number, because the mean of its divisors is an integer number (50096838).

Almost surely, 2^166989455 is an apocalyptic number.

166989455 is a deficient number, since it is larger than the sum of its proper divisors (33397897).

166989455 is an equidigital number, since it uses as much as digits as its factorization.

166989455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33397896.

The product of its digits is 2332800, while the sum is 53.

The square root of 166989455 is about 12922.4399785799. The cubic root of 166989455 is about 550.6762535698.

The spelling of 166989455 in words is "one hundred sixty-six million, nine hundred eighty-nine thousand, four hundred fifty-five".