5618661 has 8 divisors (see below), whose sum is σ = 7885920. Its totient is φ = 3548592.

The previous prime is 5618633. The next prime is 5618671. The reversal of 5618661 is 1668165.

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

It is not a de Polignac number, because 5618661 - 2⁶ = 5618597 is a prime.

5618661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5618611) 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, 49230 + ... + 49343.

It is an arithmetic number, because the mean of its divisors is an integer number (985740).

Almost surely, 2^5618661 is an apocalyptic number.

It is an amenable number.

5618661 is a deficient number, since it is larger than the sum of its proper divisors (2267259).

5618661 is a wasteful number, since it uses less digits than its factorization.

5618661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98595.

The product of its digits is 8640, while the sum is 33.

The square root of 5618661 is about 2370.3714898724. The cubic root of 5618661 is about 177.7778337529. Note that the first 3 decimals are identical.

The spelling of 5618661 in words is "five million, six hundred eighteen thousand, six hundred sixty-one".