1966945379 has 16 divisors (see below), whose sum is σ = 2367482880. Its totient is φ = 1596386880.

The previous prime is 1966945333. The next prime is 1966945391. The reversal of 1966945379 is 9735496691.

It is a cyclic number.

It is not a de Polignac number, because 1966945379 - 2¹² = 1966941283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1966945879) 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 15 ways as a sum of consecutive naturals, for example, 480887 + ... + 484959.

It is an arithmetic number, because the mean of its divisors is an integer number (147967680).

Almost surely, 2^1966945379 is an apocalyptic number.

1966945379 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1966945379 is a deficient number, since it is larger than the sum of its proper divisors (400537501).

1966945379 is a wasteful number, since it uses less digits than its factorization.

1966945379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7730.

The product of its digits is 11022480, while the sum is 59.

The square root of 1966945379 is about 44350.2579361158. The cubic root of 1966945379 is about 1252.9414205271.

The spelling of 1966945379 in words is "one billion, nine hundred sixty-six million, nine hundred forty-five thousand, three hundred seventy-nine".