2006116661 has 2 divisors, whose sum is σ = 2006116662. Its totient is φ = 2006116660.

The previous prime is 2006116657. The next prime is 2006116681. The reversal of 2006116661 is 1666116002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1116228100 + 889888561 = 33410^2 + 29831^2 .

It is a cyclic number.

It is not a de Polignac number, because 2006116661 - 2² = 2006116657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2006116631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1003058330 + 1003058331.

It is an arithmetic number, because the mean of its divisors is an integer number (1003058331).

Almost surely, 2^2006116661 is an apocalyptic number.

It is an amenable number.

2006116661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2006116661 is an equidigital number, since it uses as much as digits as its factorization.

2006116661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 2006116661 is about 44789.6936917412. The cubic root of 2006116661 is about 1261.2041610480.

The spelling of 2006116661 in words is "two billion, six million, one hundred sixteen thousand, six hundred sixty-one".