65876778677 has 2 divisors, whose sum is σ = 65876778678. Its totient is φ = 65876778676.

The previous prime is 65876778629. The next prime is 65876778719. The reversal of 65876778677 is 77687767856.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46590790801 + 19285987876 = 215849^2 + 138874^2 .

It is a cyclic number.

It is not a de Polignac number, because 65876778677 - 2²⁰ = 65875730101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65876778977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32938389338 + 32938389339.

It is an arithmetic number, because the mean of its divisors is an integer number (32938389339).

Almost surely, 2^65876778677 is an apocalyptic number.

It is an amenable number.

65876778677 is a deficient number, since it is larger than the sum of its proper divisors (1).

65876778677 is an equidigital number, since it uses as much as digits as its factorization.

65876778677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161699840, while the sum is 74.

The spelling of 65876778677 in words is "sixty-five billion, eight hundred seventy-six million, seven hundred seventy-eight thousand, six hundred seventy-seven".