191918066 has 16 divisors (see below), whose sum is σ = 305708256. Its totient is φ = 90048576.

The previous prime is 191918063. The next prime is 191918081. The reversal of 191918066 is 660819191.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (191918063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3665 + ... + 19931.

It is an arithmetic number, because the mean of its divisors is an integer number (19106766).

Almost surely, 2^191918066 is an apocalyptic number.

191918066 is a deficient number, since it is larger than the sum of its proper divisors (113790190).

191918066 is a wasteful number, since it uses less digits than its factorization.

191918066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16633.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 191918066 is about 13853.4496065060. The cubic root of 191918066 is about 576.8177544497.

The spelling of 191918066 in words is "one hundred ninety-one million, nine hundred eighteen thousand, sixty-six".