191666460 has 24 divisors (see below), whose sum is σ = 536666256. Its totient is φ = 51111040.

The previous prime is 191666441. The next prime is 191666473. The reversal of 191666460 is 64666191.

191666460 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 an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1597161 + ... + 1597280.

It is an arithmetic number, because the mean of its divisors is an integer number (22361094).

Almost surely, 2^191666460 is an apocalyptic number.

191666460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191666460 is an abundant number, since it is smaller than the sum of its proper divisors (344999796).

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

191666460 is a wasteful number, since it uses less digits than its factorization.

191666460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3194453 (or 3194451 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 191666460 is about 13844.3656409386. The cubic root of 191666460 is about 576.5655734371.

The spelling of 191666460 in words is "one hundred ninety-one million, six hundred sixty-six thousand, four hundred sixty".