166986988 has 48 divisors (see below), whose sum is σ = 365843520. Its totient is φ = 65028096.

The previous prime is 166986979. The next prime is 166986997. The reversal of 166986988 is 889689661.

It is an interprime number because it is at equal distance from previous prime (166986979) and next prime (166986997).

It is a super-2 number, since 2×166986988² = 55769308322624288, which contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7756 + ... + 19852.

It is an arithmetic number, because the mean of its divisors is an integer number (7621740).

Almost surely, 2^166986988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166986988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182921760).

166986988 is an abundant number, since it is smaller than the sum of its proper divisors (198856532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166986988 is a wasteful number, since it uses less digits than its factorization.

166986988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12154 (or 12152 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 61.

The square root of 166986988 is about 12922.3445241179. The cubic root of 166986988 is about 550.6735417718.

The spelling of 166986988 in words is "one hundred sixty-six million, nine hundred eighty-six thousand, nine hundred eighty-eight".