8661556 has 12 divisors (see below), whose sum is σ = 15184260. Its totient is φ = 4323200.

The previous prime is 8661553. The next prime is 8661557. The reversal of 8661556 is 6551668.

It can be written as a sum of positive squares in 2 ways, for example, as 7728400 + 933156 = 2780^2 + 966^2 .

It is a super-2 number, since 2×8661556² = 150045104682272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8661553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1260 + ... + 4348.

It is an arithmetic number, because the mean of its divisors is an integer number (1265355).

Almost surely, 2^8661556 is an apocalyptic number.

It is an amenable number.

8661556 is a deficient number, since it is larger than the sum of its proper divisors (6522704).

8661556 is a wasteful number, since it uses less digits than its factorization.

8661556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3794 (or 3792 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

The square root of 8661556 is about 2943.0521572001. The cubic root of 8661556 is about 205.3676211458.

The spelling of 8661556 in words is "eight million, six hundred sixty-one thousand, five hundred fifty-six".