1643313466 has 16 divisors (see below), whose sum is σ = 2611178856. Its totient is φ = 772965376.

The previous prime is 1643313421. The next prime is 1643313473. The reversal of 1643313466 is 6643133461.

It can be written as a sum of positive squares in 4 ways, for example, as 1522950625 + 120362841 = 39025^2 + 10971^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72180 + ... + 92176.

Almost surely, 2^1643313466 is an apocalyptic number.

1643313466 is a deficient number, since it is larger than the sum of its proper divisors (967865390).

1643313466 is a wasteful number, since it uses less digits than its factorization.

1643313466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22433.

The product of its digits is 93312, while the sum is 37.

The square root of 1643313466 is about 40537.8029251710. The cubic root of 1643313466 is about 1180.0673776523.

The spelling of 1643313466 in words is "one billion, six hundred forty-three million, three hundred thirteen thousand, four hundred sixty-six".