66112191 has 12 divisors (see below), whose sum is σ = 100521720. Its totient is φ = 41754960.

The previous prime is 66112187. The next prime is 66112219. The reversal of 66112191 is 19121166.

It is not a de Polignac number, because 66112191 - 2² = 66112187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66112121) 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 11 ways as a sum of consecutive naturals, for example, 193140 + ... + 193481.

It is an arithmetic number, because the mean of its divisors is an integer number (8376810).

Almost surely, 2^66112191 is an apocalyptic number.

66112191 is a deficient number, since it is larger than the sum of its proper divisors (34409529).

66112191 is a wasteful number, since it uses less digits than its factorization.

66112191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386646 (or 386643 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 66112191 is about 8130.9403515215. The cubic root of 66112191 is about 404.3528576686.

Subtracting from 66112191 its reverse (19121166), we obtain a square (46991025 = 6855²).

The spelling of 66112191 in words is "sixty-six million, one hundred twelve thousand, one hundred ninety-one".