2007661 has 2 divisors, whose sum is σ = 2007662. Its totient is φ = 2007660.

The previous prime is 2007659. The next prime is 2007679. The reversal of 2007661 is 1667002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1142761 + 864900 = 1069^2 + 930^2 .

It is a cyclic number.

It is not a de Polignac number, because 2007661 - 2¹ = 2007659 is a prime.

Together with 2007659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2007611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1003830 + 1003831.

It is an arithmetic number, because the mean of its divisors is an integer number (1003831).

2^2007661 is an apocalyptic number.

It is an amenable number.

2007661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2007661 is an equidigital number, since it uses as much as digits as its factorization.

2007661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 2007661 is about 1416.9195460576. The cubic root of 2007661 is about 126.1527709395.

The spelling of 2007661 in words is "two million, seven thousand, six hundred sixty-one".