2655666 has 60 divisors (see below), whose sum is σ = 6510042. Its totient is φ = 808704.

The previous prime is 2655661. The next prime is 2655691. The reversal of 2655666 is 6665562.

It can be written as a sum of positive squares in 3 ways, for example, as 1265625 + 1390041 = 1125^2 + 1179^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2655666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2655661) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 27330 + ... + 27426.

2^2655666 is an apocalyptic number.

2655666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2655666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3255021).

2655666 is an abundant number, since it is smaller than the sum of its proper divisors (3854376).

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

2655666 is a wasteful number, since it uses less digits than its factorization.

2655666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 115 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 2655666 is about 1629.6214284305. The cubic root of 2655666 is about 138.4813061521.

It can be divided in two parts, 2655 and 666, that added together give a triangular number (3321 = T₈₁).

The spelling of 2655666 in words is "two million, six hundred fifty-five thousand, six hundred sixty-six".