166998640 has 20 divisors (see below), whose sum is σ = 388272024. Its totient is φ = 66799424.

The previous prime is 166998613. The next prime is 166998641. The reversal of 166998640 is 46899661.

166998640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166998641) 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 3 ways as a sum of consecutive naturals, for example, 1043662 + ... + 1043821.

Almost surely, 2^166998640 is an apocalyptic number.

166998640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166998640 is an abundant number, since it is smaller than the sum of its proper divisors (221273384).

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

166998640 is a wasteful number, since it uses less digits than its factorization.

166998640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2087496 (or 2087490 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 166998640 is about 12922.7953632331. The cubic root of 166998640 is about 550.6863497535.

The spelling of 166998640 in words is "one hundred sixty-six million, nine hundred ninety-eight thousand, six hundred forty".