166853840 has 20 divisors (see below), whose sum is σ = 387935364. Its totient is φ = 66741504.

The previous prime is 166853833. The next prime is 166853851. The reversal of 166853840 is 48358661.

It can be written as a sum of positive squares in 2 ways, for example, as 40246336 + 126607504 = 6344^2 + 11252^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1042757 + ... + 1042916.

Almost surely, 2^166853840 is an apocalyptic number.

166853840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166853840 is an abundant number, since it is smaller than the sum of its proper divisors (221081524).

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

166853840 is a wasteful number, since it uses less digits than its factorization.

166853840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085686 (or 2085680 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 166853840 is about 12917.1916452455. The cubic root of 166853840 is about 550.5271419876.

The spelling of 166853840 in words is "one hundred sixty-six million, eight hundred fifty-three thousand, eight hundred forty".