8555661 has 12 divisors (see below), whose sum is σ = 12397788. Its totient is φ = 5685504.

The previous prime is 8555639. The next prime is 8555683. The reversal of 8555661 is 1665558.

It is an interprime number because it is at equal distance from previous prime (8555639) and next prime (8555683).

It can be written as a sum of positive squares in 2 ways, for example, as 3493161 + 5062500 = 1869^2 + 2250^2 .

It is not a de Polignac number, because 8555661 - 2⁵ = 8555629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8555611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1831 + ... + 4523.

It is an arithmetic number, because the mean of its divisors is an integer number (1033149).

Almost surely, 2^8555661 is an apocalyptic number.

It is an amenable number.

8555661 is a deficient number, since it is larger than the sum of its proper divisors (3842127).

8555661 is a wasteful number, since it uses less digits than its factorization.

8555661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3052 (or 3049 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 8555661 is about 2925.0061538397. The cubic root of 8555661 is about 204.5272548925.

Subtracting from 8555661 its sum of digits (36), we obtain a square (8555625 = 2925²).

It can be divided in two parts, 8555 and 661, that added together give a square (9216 = 96²).

The spelling of 8555661 in words is "eight million, five hundred fifty-five thousand, six hundred sixty-one".