2066651 has 4 divisors (see below), whose sum is σ = 2069592. Its totient is φ = 2063712.

The previous prime is 2066641. The next prime is 2066653. The reversal of 2066651 is 1566602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2066651 - 2⁶ = 2066587 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2066651.

It is not an unprimeable number, because it can be changed into a prime (2066653) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 275 + ... + 2051.

It is an arithmetic number, because the mean of its divisors is an integer number (517398).

2^2066651 is an apocalyptic number.

2066651 is a deficient number, since it is larger than the sum of its proper divisors (2941).

2066651 is a wasteful number, since it uses less digits than its factorization.

2066651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2940.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2066651 is about 1437.5851279142. The cubic root of 2066651 is about 127.3764226188.

The spelling of 2066651 in words is "two million, sixty-six thousand, six hundred fifty-one".