191628326066 has 4 divisors (see below), whose sum is σ = 287442489102. Its totient is φ = 95814163032.

The previous prime is 191628326053. The next prime is 191628326081. The reversal of 191628326066 is 660623826191.

191628326066 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: 660623826191 = 7 ⋅94374832313.

It can be written as a sum of positive squares in only one way, i.e., 128138941225 + 63489384841 = 357965^2 + 251971^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47907081515 + ... + 47907081518.

Almost surely, 2^191628326066 is an apocalyptic number.

191628326066 is a deficient number, since it is larger than the sum of its proper divisors (95814163036).

191628326066 is an equidigital number, since it uses as much as digits as its factorization.

191628326066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95814163035.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The spelling of 191628326066 in words is "one hundred ninety-one billion, six hundred twenty-eight million, three hundred twenty-six thousand, sixty-six".