477785486861 has 2 divisors, whose sum is σ = 477785486862. Its totient is φ = 477785486860.

The previous prime is 477785486821. The next prime is 477785486881. The reversal of 477785486861 is 168684587774.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 474625922761 + 3159564100 = 688931^2 + 56210^2 .

It is a cyclic number.

It is not a de Polignac number, because 477785486861 - 2⁶ = 477785486797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (477785486821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 238892743430 + 238892743431.

It is an arithmetic number, because the mean of its divisors is an integer number (238892743431).

Almost surely, 2^477785486861 is an apocalyptic number.

It is an amenable number.

477785486861 is a deficient number, since it is larger than the sum of its proper divisors (1).

477785486861 is an equidigital number, since it uses as much as digits as its factorization.

477785486861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 505774080, while the sum is 71.

The spelling of 477785486861 in words is "four hundred seventy-seven billion, seven hundred eighty-five million, four hundred eighty-six thousand, eight hundred sixty-one".