166942689 has 8 divisors (see below), whose sum is σ = 222812352. Its totient is φ = 111184080.

The previous prime is 166942687. The next prime is 166942691. The reversal of 166942689 is 986249661.

It is an interprime number because it is at equal distance from previous prime (166942687) and next prime (166942691).

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

It is not a de Polignac number, because 166942689 - 2¹ = 166942687 is a prime.

It is a super-2 number, since 2×166942689² = 55739722821101442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166942687) 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, 24189 + ... + 30314.

It is an arithmetic number, because the mean of its divisors is an integer number (27851544).

Almost surely, 2^166942689 is an apocalyptic number.

It is an amenable number.

166942689 is a deficient number, since it is larger than the sum of its proper divisors (55869663).

166942689 is a wasteful number, since it uses less digits than its factorization.

166942689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55527.

The product of its digits is 1119744, while the sum is 51.

The square root of 166942689 is about 12920.6303638793. The cubic root of 166942689 is about 550.6248424789.

The spelling of 166942689 in words is "one hundred sixty-six million, nine hundred forty-two thousand, six hundred eighty-nine".