677759861 has 2 divisors, whose sum is σ = 677759862. Its totient is φ = 677759860.

The previous prime is 677759857. The next prime is 677759869. The reversal of 677759861 is 168957776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 547092100 + 130667761 = 23390^2 + 11431^2 .

It is a cyclic number.

It is not a de Polignac number, because 677759861 - 2² = 677759857 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 677759797 and 677759806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677759869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338879930 + 338879931.

It is an arithmetic number, because the mean of its divisors is an integer number (338879931).

Almost surely, 2^677759861 is an apocalyptic number.

It is an amenable number.

677759861 is a deficient number, since it is larger than the sum of its proper divisors (1).

677759861 is an equidigital number, since it uses as much as digits as its factorization.

677759861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4445280, while the sum is 56.

The square root of 677759861 is about 26033.8214828327. The cubic root of 677759861 is about 878.3992339138.

The spelling of 677759861 in words is "six hundred seventy-seven million, seven hundred fifty-nine thousand, eight hundred sixty-one".