3643122661 has 8 divisors (see below), whose sum is σ = 3868876440. Its totient is φ = 3418641408.

The previous prime is 3643122631. The next prime is 3643122689. The reversal of 3643122661 is 1662213463.

3643122661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1135016100 + 2508106561 = 33690^2 + 50081^2 .

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 3643122661 - 2²⁵ = 3609568229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643122631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312226 + ... + 323683.

It is an arithmetic number, because the mean of its divisors is an integer number (483609555).

Almost surely, 2^3643122661 is an apocalyptic number.

It is an amenable number.

3643122661 is a deficient number, since it is larger than the sum of its proper divisors (225753779).

3643122661 is a wasteful number, since it uses less digits than its factorization.

3643122661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636263.

The product of its digits is 31104, while the sum is 34.

The square root of 3643122661 is about 60358.2857692297. The cubic root of 3643122661 is about 1538.7140922704.

The spelling of 3643122661 in words is "three billion, six hundred forty-three million, one hundred twenty-two thousand, six hundred sixty-one".