3643557165 has 24 divisors (see below), whose sum is σ = 6380614968. Its totient is φ = 1923194880.

The previous prime is 3643557161. The next prime is 3643557179. The reversal of 3643557165 is 5617553463.

3643557165 is a `hidden beast` number, since 3 + 6 + 435 + 57 + 165 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2762244 + 3640794921 = 1662^2 + 60339^2 .

It is not a de Polignac number, because 3643557165 - 2² = 3643557161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 3643557165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643557161) 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, 412996 + ... + 421725.

It is an arithmetic number, because the mean of its divisors is an integer number (265858957).

Almost surely, 2^3643557165 is an apocalyptic number.

It is an amenable number.

3643557165 is a deficient number, since it is larger than the sum of its proper divisors (2737057803).

3643557165 is a wasteful number, since it uses less digits than its factorization.

3643557165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834829 (or 834826 counting only the distinct ones).

The product of its digits is 1134000, while the sum is 45.

The square root of 3643557165 is about 60361.8850351776. The cubic root of 3643557165 is about 1538.7752623994.

The spelling of 3643557165 in words is "three billion, six hundred forty-three million, five hundred fifty-seven thousand, one hundred sixty-five".