5661555 has 24 divisors (see below), whose sum is σ = 9396336. Its totient is φ = 2908800.

The previous prime is 5661547. The next prime is 5661559. The reversal of 5661555 is 5551665.

It is not a de Polignac number, because 5661555 - 2³ = 5661547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5661559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56005 + ... + 56105.

It is an arithmetic number, because the mean of its divisors is an integer number (391514).

Almost surely, 2^5661555 is an apocalyptic number.

5661555 is a deficient number, since it is larger than the sum of its proper divisors (3734781).

5661555 is a wasteful number, since it uses less digits than its factorization.

5661555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 146 counting only the distinct ones).

The product of its digits is 22500, while the sum is 33.

The square root of 5661555 is about 2379.4022358567. The cubic root of 5661555 is about 178.2290847510.

It can be divided in two parts, 5661 and 555, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 5661555 in words is "five million, six hundred sixty-one thousand, five hundred fifty-five".