191660 has 36 divisors (see below), whose sum is σ = 472752. Its totient is φ = 63936.

The previous prime is 191657. The next prime is 191669. The reversal of 191660 is 66191.

191660 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (191669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5162 + ... + 5198.

It is an arithmetic number, because the mean of its divisors is an integer number (13132).

2¹⁹¹⁶⁶⁰ is an apocalyptic number.

191660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236376).

191660 is an abundant number, since it is smaller than the sum of its proper divisors (281092).

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

191660 is a wasteful number, since it uses less digits than its factorization.

191660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 191660 is about 437.7899039494. The cubic root of 191660 is about 57.6559095768.

It can be divided in two parts, 1916 and 60, that multiplied together give a triangular number (114960 = T₄₇₉).

The spelling of 191660 in words is "one hundred ninety-one thousand, six hundred sixty".