1643365366 has 16 divisors (see below), whose sum is σ = 2678492160. Its totient is φ = 753324840.

The previous prime is 1643365351. The next prime is 1643365369. The reversal of 1643365366 is 6635633461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643365369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696346 + ... + 698701.

It is an arithmetic number, because the mean of its divisors is an integer number (167405760).

Almost surely, 2^1643365366 is an apocalyptic number.

1643365366 is a deficient number, since it is larger than the sum of its proper divisors (1035126794).

1643365366 is a wasteful number, since it uses less digits than its factorization.

1643365366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395099.

The product of its digits is 699840, while the sum is 43.

The square root of 1643365366 is about 40538.4430633442. The cubic root of 1643365366 is about 1180.0798006933.

The spelling of 1643365366 in words is "one billion, six hundred forty-three million, three hundred sixty-five thousand, three hundred sixty-six".