2000661 has 16 divisors (see below), whose sum is σ = 2942016. Its totient is φ = 1201536.

The previous prime is 2000659. The next prime is 2000671. The reversal of 2000661 is 1660002.

It is not a de Polignac number, because 2000661 - 2¹ = 2000659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2000661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2000671) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 1081 + ... + 2273.

It is an arithmetic number, because the mean of its divisors is an integer number (183876).

2^2000661 is an apocalyptic number.

It is an amenable number.

2000661 is a deficient number, since it is larger than the sum of its proper divisors (941355).

2000661 is a wasteful number, since it uses less digits than its factorization.

2000661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2000661 is about 1414.4472418581. The cubic root of 2000661 is about 126.0059835909.

Adding to 2000661 its reverse (1660002), we get a palindrome (3660663).

The spelling of 2000661 in words is "two million, six hundred sixty-one", and thus it is an aban number.