166889557 has 8 divisors (see below), whose sum is σ = 172311552. Its totient is φ = 161532000.

The previous prime is 166889551. The next prime is 166889581. The reversal of 166889557 is 755988661.

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 166889557 - 2³ = 166889549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166889498 and 166889507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166889551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10819 + ... + 21232.

It is an arithmetic number, because the mean of its divisors is an integer number (21538944).

Almost surely, 2^166889557 is an apocalyptic number.

It is an amenable number.

166889557 is a deficient number, since it is larger than the sum of its proper divisors (5421995).

166889557 is a wasteful number, since it uses less digits than its factorization.

166889557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32219.

The product of its digits is 3628800, while the sum is 55.

The square root of 166889557 is about 12918.5741086236. The cubic root of 166889557 is about 550.5664214253.

The spelling of 166889557 in words is "one hundred sixty-six million, eight hundred eighty-nine thousand, five hundred fifty-seven".