166980961 has 8 divisors (see below), whose sum is σ = 192052160. Its totient is φ = 142213968.

The previous prime is 166980959. The next prime is 166980967. The reversal of 166980961 is 169089661.

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 166980961 - 2¹ = 166980959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166980967) 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, 74871 + ... + 77068.

It is an arithmetic number, because the mean of its divisors is an integer number (24006520).

Almost surely, 2^166980961 is an apocalyptic number.

It is an amenable number.

166980961 is a deficient number, since it is larger than the sum of its proper divisors (25071199).

166980961 is a wasteful number, since it uses less digits than its factorization.

166980961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152103.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 166980961 is about 12922.1113212973. Note that the first 3 decimals coincide. The cubic root of 166980961 is about 550.6669166061. Note that the first 3 decimals are identical.

The spelling of 166980961 in words is "one hundred sixty-six million, nine hundred eighty thousand, nine hundred sixty-one".