1643298966 has 12 divisors (see below), whose sum is σ = 3560481132. Its totient is φ = 547766316.

The previous prime is 1643298919. The next prime is 1643298967. The reversal of 1643298966 is 6698923461.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643298967) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45647176 + ... + 45647211.

It is an arithmetic number, because the mean of its divisors is an integer number (296706761).

Almost surely, 2^1643298966 is an apocalyptic number.

1643298966 is an abundant number, since it is smaller than the sum of its proper divisors (1917182166).

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

1643298966 is a wasteful number, since it uses less digits than its factorization.

1643298966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91294395 (or 91294392 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 54.

The square root of 1643298966 is about 40537.6240793661. The cubic root of 1643298966 is about 1180.0639068137.

The spelling of 1643298966 in words is "one billion, six hundred forty-three million, two hundred ninety-eight thousand, nine hundred sixty-six".