2661556 has 12 divisors (see below), whose sum is σ = 4771620. Its totient is φ = 1298240.

The previous prime is 2661553. The next prime is 2661557. The reversal of 2661556 is 6551662.

It can be written as a sum of positive squares in 2 ways, for example, as 1416100 + 1245456 = 1190^2 + 1116^2 .

It is a super-2 number, since 2×2661556² = 14167760682272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661553) 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, 7951 + ... + 8278.

It is an arithmetic number, because the mean of its divisors is an integer number (397635).

2^2661556 is an apocalyptic number.

It is an amenable number.

2661556 is a deficient number, since it is larger than the sum of its proper divisors (2110064).

2661556 is a wasteful number, since it uses less digits than its factorization.

2661556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16274 (or 16272 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 2661556 is about 1631.4275956965. The cubic root of 2661556 is about 138.5836097577.

The spelling of 2661556 in words is "two million, six hundred sixty-one thousand, five hundred fifty-six".