166971887 has 8 divisors (see below), whose sum is σ = 169014000. Its totient is φ = 164937600.

The previous prime is 166971869. The next prime is 166971899. The reversal of 166971887 is 788179661.

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 166971887 - 2¹⁶ = 166906351 is a prime.

It is a super-3 number, since 3×166971887³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166971587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48743 + ... + 52055.

It is an arithmetic number, because the mean of its divisors is an integer number (21126750).

Almost surely, 2^166971887 is an apocalyptic number.

166971887 is a deficient number, since it is larger than the sum of its proper divisors (2042113).

166971887 is a wasteful number, since it uses less digits than its factorization.

166971887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3913.

The product of its digits is 1016064, while the sum is 53.

The square root of 166971887 is about 12921.7602129122. The cubic root of 166971887 is about 550.6569417322.

The spelling of 166971887 in words is "one hundred sixty-six million, nine hundred seventy-one thousand, eight hundred eighty-seven".