3644220061 has 4 divisors (see below), whose sum is σ = 3648186400. Its totient is φ = 3640253724.

The previous prime is 3644220043. The next prime is 3644220103. The reversal of 3644220061 is 1600224463.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3644220061 - 2⁹ = 3644219549 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 (3644220661) 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 3 ways as a sum of consecutive naturals, for example, 1981791 + ... + 1983628.

It is an arithmetic number, because the mean of its divisors is an integer number (912046600).

Almost surely, 2^3644220061 is an apocalyptic number.

It is an amenable number.

3644220061 is a deficient number, since it is larger than the sum of its proper divisors (3966339).

3644220061 is an equidigital number, since it uses as much as digits as its factorization.

3644220061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3966338.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 3644220061 is about 60367.3758001787. The cubic root of 3644220061 is about 1538.8685765304.

The spelling of 3644220061 in words is "three billion, six hundred forty-four million, two hundred twenty thousand, sixty-one".