1966819668 has 72 divisors (see below), whose sum is σ = 5078791200. Its totient is φ = 591940800.

The previous prime is 1966819661. The next prime is 1966819703. The reversal of 1966819668 is 8669186691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966819661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 211803 + ... + 220893.

Almost surely, 2^1966819668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1966819668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2539395600).

1966819668 is an abundant number, since it is smaller than the sum of its proper divisors (3111971532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1966819668 is a wasteful number, since it uses less digits than its factorization.

1966819668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9269 (or 9256 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 60.

The square root of 1966819668 is about 44348.8406612845. The cubic root of 1966819668 is about 1252.9147273821.

The spelling of 1966819668 in words is "one billion, nine hundred sixty-six million, eight hundred nineteen thousand, six hundred sixty-eight".