5661816 has 32 divisors (see below), whose sum is σ = 14988240. Its totient is φ = 1776128.

The previous prime is 5661811. The next prime is 5661823. The reversal of 5661816 is 6181665.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6531 + ... + 7346.

Almost surely, 2^5661816 is an apocalyptic number.

It is an amenable number.

5661816 is an abundant number, since it is smaller than the sum of its proper divisors (9326424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5661816 is a wasteful number, since it uses less digits than its factorization.

5661816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13903 (or 13899 counting only the distinct ones).

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

The square root of 5661816 is about 2379.4570809325. The cubic root of 5661816 is about 178.2318235201.

The spelling of 5661816 in words is "five million, six hundred sixty-one thousand, eight hundred sixteen".