3644066661 has 4 divisors (see below), whose sum is σ = 4858755552. Its totient is φ = 2429377772.

The previous prime is 3644066623. The next prime is 3644066669. The reversal of 3644066661 is 1666604463.

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 3644066661 - 2⁶ = 3644066597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3644066669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607344441 + ... + 607344446.

It is an arithmetic number, because the mean of its divisors is an integer number (1214688888).

Almost surely, 2^3644066661 is an apocalyptic number.

It is an amenable number.

3644066661 is a deficient number, since it is larger than the sum of its proper divisors (1214688891).

3644066661 is a wasteful number, since it uses less digits than its factorization.

3644066661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214688890.

The product of its (nonzero) digits is 373248, while the sum is 42.

The square root of 3644066661 is about 60366.1052329865. The cubic root of 3644066661 is about 1538.8469838212.

The spelling of 3644066661 in words is "three billion, six hundred forty-four million, sixty-six thousand, six hundred sixty-one".