168861660 has 48 divisors (see below), whose sum is σ = 515797632. Its totient is φ = 40936000.

The previous prime is 168861617. The next prime is 168861661. The reversal of 168861660 is 66168861.

168861660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168861661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127266 + ... + 128585.

It is an arithmetic number, because the mean of its divisors is an integer number (10745784).

Almost surely, 2^168861660 is an apocalyptic number.

168861660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168861660 is an abundant number, since it is smaller than the sum of its proper divisors (346935972).

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

168861660 is a wasteful number, since it uses less digits than its factorization.

168861660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255874 (or 255872 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 168861660 is about 12994.6781414547. The cubic root of 168861660 is about 552.7265820583.

The spelling of 168861660 in words is "one hundred sixty-eight million, eight hundred sixty-one thousand, six hundred sixty".