2566646 has 4 divisors (see below), whose sum is σ = 3849972. Its totient is φ = 1283322.

The previous prime is 2566637. The next prime is 2566651. The reversal of 2566646 is 6466652.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641660 + ... + 641663.

It is an arithmetic number, because the mean of its divisors is an integer number (962493).

2^2566646 is an apocalyptic number.

2566646 is a deficient number, since it is larger than the sum of its proper divisors (1283326).

2566646 is a wasteful number, since it uses less digits than its factorization.

2566646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283325.

The product of its digits is 51840, while the sum is 35.

The square root of 2566646 is about 1602.0755288063. The cubic root of 2566646 is about 136.9163536494.

The spelling of 2566646 in words is "two million, five hundred sixty-six thousand, six hundred forty-six".