191260066 has 4 divisors (see below), whose sum is σ = 286890102. Its totient is φ = 95630032.

The previous prime is 191260063. The next prime is 191260109. The reversal of 191260066 is 660062191.

191260066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 660062191 = 569 ⋅1160039.

It can be written as a sum of positive squares in only one way, i.e., 109809441 + 81450625 = 10479^2 + 9025^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (191260063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47815015 + ... + 47815018.

Almost surely, 2^191260066 is an apocalyptic number.

191260066 is a deficient number, since it is larger than the sum of its proper divisors (95630036).

191260066 is an equidigital number, since it uses as much as digits as its factorization.

191260066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95630035.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 191260066 is about 13829.6806181488. The cubic root of 191260066 is about 576.1577841436.

The spelling of 191260066 in words is "one hundred ninety-one million, two hundred sixty thousand, sixty-six".