2785665977 has 2 divisors, whose sum is σ = 2785665978. Its totient is φ = 2785665976.

The previous prime is 2785665959. The next prime is 2785665989. The reversal of 2785665977 is 7795665872.

2785665977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2195953321 + 589712656 = 46861^2 + 24284^2 .

It is a cyclic number.

It is not a de Polignac number, because 2785665977 - 2¹⁰ = 2785664953 is a prime.

It is not a weakly prime, because it can be changed into another prime (2785665937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1392832988 + 1392832989.

It is an arithmetic number, because the mean of its divisors is an integer number (1392832989).

Almost surely, 2^2785665977 is an apocalyptic number.

It is an amenable number.

2785665977 is a deficient number, since it is larger than the sum of its proper divisors (1).

2785665977 is an equidigital number, since it uses as much as digits as its factorization.

2785665977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44452800, while the sum is 62.

The square root of 2785665977 is about 52779.4086457967. The cubic root of 2785665977 is about 1407.0504842427.

The spelling of 2785665977 in words is "two billion, seven hundred eighty-five million, six hundred sixty-five thousand, nine hundred seventy-seven".