191065660 has 12 divisors (see below), whose sum is σ = 401237928. Its totient is φ = 76426256.

The previous prime is 191065631. The next prime is 191065661. The reversal of 191065660 is 66560191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191065661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4776622 + ... + 4776661.

It is an arithmetic number, because the mean of its divisors is an integer number (33436494).

Almost surely, 2^191065660 is an apocalyptic number.

191065660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191065660 is an abundant number, since it is smaller than the sum of its proper divisors (210172268).

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

191065660 is a wasteful number, since it uses less digits than its factorization.

191065660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9553292 (or 9553290 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 191065660 is about 13822.6502523937. The cubic root of 191065660 is about 575.9625064008.

The spelling of 191065660 in words is "one hundred ninety-one million, sixty-five thousand, six hundred sixty".