1966509067 has 4 divisors (see below), whose sum is σ = 2012241880. Its totient is φ = 1920776256.

The previous prime is 1966509059. The next prime is 1966509079. The reversal of 1966509067 is 7609056691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7609056691 = 89 ⋅85495019.

It is a cyclic number.

It is not a de Polignac number, because 1966509067 - 2³ = 1966509059 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1966509067.

It is not an unprimeable number, because it can be changed into a prime (1966509037) 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, 22866342 + ... + 22866427.

It is an arithmetic number, because the mean of its divisors is an integer number (503060470).

Almost surely, 2^1966509067 is an apocalyptic number.

1966509067 is a deficient number, since it is larger than the sum of its proper divisors (45732813).

1966509067 is an equidigital number, since it uses as much as digits as its factorization.

1966509067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45732812.

The product of its (nonzero) digits is 612360, while the sum is 49.

The square root of 1966509067 is about 44345.3387291156. The cubic root of 1966509067 is about 1252.8487703008.

The spelling of 1966509067 in words is "one billion, nine hundred sixty-six million, five hundred nine thousand, sixty-seven".