3644166661 has 8 divisors (see below), whose sum is σ = 3709563264. Its totient is φ = 3579161040.

The previous prime is 3644166637. The next prime is 3644166671. The reversal of 3644166661 is 1666614463.

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 3644166661 - 2⁵ = 3644166629 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 (3644166611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78906 + ... + 116251.

It is an arithmetic number, because the mean of its divisors is an integer number (463695408).

Almost surely, 2^3644166661 is an apocalyptic number.

It is an amenable number.

3644166661 is a deficient number, since it is larger than the sum of its proper divisors (65396603).

3644166661 is a wasteful number, since it uses less digits than its factorization.

3644166661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195491.

The product of its digits is 373248, while the sum is 43.

The square root of 3644166661 is about 60366.9335066806. The cubic root of 3644166661 is about 1538.8610599715.

The spelling of 3644166661 in words is "three billion, six hundred forty-four million, one hundred sixty-six thousand, six hundred sixty-one".