1643313165 has 16 divisors (see below), whose sum is σ = 2831555328. Its totient is φ = 809015616.

The previous prime is 1643313163. The next prime is 1643313167. The reversal of 1643313165 is 5613133461.

It is an interprime number because it is at equal distance from previous prime (1643313163) and next prime (1643313167).

It is not a de Polignac number, because 1643313165 - 2¹ = 1643313163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643313163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4213429 + ... + 4213818.

It is an arithmetic number, because the mean of its divisors is an integer number (176972208).

Almost surely, 2^1643313165 is an apocalyptic number.

1643313165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1643313165 is a deficient number, since it is larger than the sum of its proper divisors (1188242163).

1643313165 is a wasteful number, since it uses less digits than its factorization.

1643313165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8427268.

The product of its digits is 19440, while the sum is 33.

The square root of 1643313165 is about 40537.7992125868. The cubic root of 1643313165 is about 1180.0673056026.

The spelling of 1643313165 in words is "one billion, six hundred forty-three million, three hundred thirteen thousand, one hundred sixty-five".