2566660 has 24 divisors (see below), whose sum is σ = 5707800. Its totient is φ = 966144.

The previous prime is 2566651. The next prime is 2566661. The reversal of 2566660 is 666652.

It can be written as a sum of positive squares in 4 ways, for example, as 948676 + 1617984 = 974^2 + 1272^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3435 + ... + 4114.

It is an arithmetic number, because the mean of its divisors is an integer number (237825).

2^2566660 is an apocalyptic number.

2566660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2566660 is an abundant number, since it is smaller than the sum of its proper divisors (3141140).

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

2566660 is a wasteful number, since it uses less digits than its factorization.

2566660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7575 (or 7573 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 2566660 is about 1602.0798981324. The cubic root of 2566660 is about 136.9166025898.

The spelling of 2566660 in words is "two million, five hundred sixty-six thousand, six hundred sixty".