3643661365 has 8 divisors (see below), whose sum is σ = 4391488440. Its totient is φ = 2902199232.

The previous prime is 3643661339. The next prime is 3643661387. The reversal of 3643661365 is 5631663463.

It can be written as a sum of positive squares in 4 ways, for example, as 2072252484 + 1571408881 = 45522^2 + 39641^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3643661365 - 2¹³ = 3643653173 is a prime.

It is a congruent number.

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, 1589974 + ... + 1592263.

It is an arithmetic number, because the mean of its divisors is an integer number (548936055).

Almost surely, 2^3643661365 is an apocalyptic number.

It is an amenable number.

3643661365 is a deficient number, since it is larger than the sum of its proper divisors (747827075).

3643661365 is a wasteful number, since it uses less digits than its factorization.

3643661365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3182471.

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

The square root of 3643661365 is about 60362.7481564582. The cubic root of 3643661365 is about 1538.7899311097.

The spelling of 3643661365 in words is "three billion, six hundred forty-three million, six hundred sixty-one thousand, three hundred sixty-five".