2006289661 has 2 divisors, whose sum is σ = 2006289662. Its totient is φ = 2006289660.

The previous prime is 2006289601. The next prime is 2006289679. The reversal of 2006289661 is 1669826002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1211388025 + 794901636 = 34805^2 + 28194^2 .

It is a cyclic number.

It is not a de Polignac number, because 2006289661 - 2⁷ = 2006289533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2006289601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1003144830 + 1003144831.

It is an arithmetic number, because the mean of its divisors is an integer number (1003144831).

Almost surely, 2^2006289661 is an apocalyptic number.

It is an amenable number.

2006289661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2006289661 is an equidigital number, since it uses as much as digits as its factorization.

2006289661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 2006289661 is about 44791.6248979650. The cubic root of 2006289661 is about 1261.2404138497.

The spelling of 2006289661 in words is "two billion, six million, two hundred eighty-nine thousand, six hundred sixty-one".