1966612909 has 4 divisors (see below), whose sum is σ = 1969232320. Its totient is φ = 1963993500.

The previous prime is 1966612903. The next prime is 1966612913. The reversal of 1966612909 is 9092166691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1966612909 - 2⁹ = 1966612397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966612903) 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, 1308579 + ... + 1310080.

It is an arithmetic number, because the mean of its divisors is an integer number (492308080).

Almost surely, 2^1966612909 is an apocalyptic number.

It is an amenable number.

1966612909 is a deficient number, since it is larger than the sum of its proper divisors (2619411).

1966612909 is an equidigital number, since it uses as much as digits as its factorization.

1966612909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2619410.

The product of its (nonzero) digits is 314928, while the sum is 49.

The square root of 1966612909 is about 44346.5095469756. The cubic root of 1966612909 is about 1252.8708222429.

The spelling of 1966612909 in words is "one billion, nine hundred sixty-six million, six hundred twelve thousand, nine hundred nine".