2006861777 has 2 divisors, whose sum is σ = 2006861778. Its totient is φ = 2006861776.

The previous prime is 2006861771. The next prime is 2006861821. The reversal of 2006861777 is 7771686002.

It is an a-pointer prime, because the next prime (2006861821) can be obtained adding 2006861777 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1260534016 + 746327761 = 35504^2 + 27319^2 .

It is a cyclic number.

It is not a de Polignac number, because 2006861777 - 2¹⁰ = 2006860753 is a prime.

It is not a weakly prime, because it can be changed into another prime (2006861771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1003430888 + 1003430889.

It is an arithmetic number, because the mean of its divisors is an integer number (1003430889).

Almost surely, 2^2006861777 is an apocalyptic number.

It is an amenable number.

2006861777 is a deficient number, since it is larger than the sum of its proper divisors (1).

2006861777 is an equidigital number, since it uses as much as digits as its factorization.

2006861777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 197568, while the sum is 44.

The square root of 2006861777 is about 44798.0108598585. The cubic root of 2006861777 is about 1261.3602880727.

The spelling of 2006861777 in words is "two billion, six million, eight hundred sixty-one thousand, seven hundred seventy-seven".