2665646 has 4 divisors (see below), whose sum is σ = 3998472. Its totient is φ = 1332822.

The previous prime is 2665627. The next prime is 2665667. The reversal of 2665646 is 6465662.

2665646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 666410 + ... + 666413.

It is an arithmetic number, because the mean of its divisors is an integer number (999618).

2^2665646 is an apocalyptic number.

2665646 is a deficient number, since it is larger than the sum of its proper divisors (1332826).

2665646 is a wasteful number, since it uses less digits than its factorization.

2665646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332825.

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

The square root of 2665646 is about 1632.6806178797. The cubic root of 2665646 is about 138.6545603439.

The spelling of 2665646 in words is "two million, six hundred sixty-five thousand, six hundred forty-six".