2061617777 has 2 divisors, whose sum is σ = 2061617778. Its totient is φ = 2061617776.

The previous prime is 2061617759. The next prime is 2061617783. The reversal of 2061617777 is 7777161602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1698181681 + 363436096 = 41209^2 + 19064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2061617777 is a prime.

It is not a weakly prime, because it can be changed into another prime (2061617737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1030808888 + 1030808889.

It is an arithmetic number, because the mean of its divisors is an integer number (1030808889).

Almost surely, 2^2061617777 is an apocalyptic number.

It is an amenable number.

2061617777 is a deficient number, since it is larger than the sum of its proper divisors (1).

2061617777 is an equidigital number, since it uses as much as digits as its factorization.

2061617777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172872, while the sum is 44.

The square root of 2061617777 is about 45405.0413170168. The cubic root of 2061617777 is about 1272.7293230003.

The spelling of 2061617777 in words is "two billion, sixty-one million, six hundred seventeen thousand, seven hundred seventy-seven".