5646661 has 8 divisors (see below), whose sum is σ = 5955264. Its totient is φ = 5343360.

The previous prime is 5646659. The next prime is 5646671. The reversal of 5646661 is 1666465.

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

It is not a de Polignac number, because 5646661 - 2¹ = 5646659 is a prime.

It is a Duffinian number.

5646661 is a lucky number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5646671) 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, 966 + ... + 3496.

It is an arithmetic number, because the mean of its divisors is an integer number (744408).

Almost surely, 2^5646661 is an apocalyptic number.

It is an amenable number.

5646661 is a deficient number, since it is larger than the sum of its proper divisors (308603).

5646661 is a wasteful number, since it uses less digits than its factorization.

5646661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651.

The product of its digits is 25920, while the sum is 34.

The square root of 5646661 is about 2376.2703970718. The cubic root of 5646661 is about 178.0726568680.

It can be divided in two parts, 564 and 6661, that added together give a square (7225 = 85²).

The spelling of 5646661 in words is "five million, six hundred forty-six thousand, six hundred sixty-one".