806215679977 has 2 divisors, whose sum is σ = 806215679978. Its totient is φ = 806215679976.

The previous prime is 806215679963. The next prime is 806215680043. The reversal of 806215679977 is 779976512608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 780084634176 + 26131045801 = 883224^2 + 161651^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-806215679977 is a prime.

It is not a weakly prime, because it can be changed into another prime (806215679947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403107839988 + 403107839989.

It is an arithmetic number, because the mean of its divisors is an integer number (403107839989).

Almost surely, 2^806215679977 is an apocalyptic number.

It is an amenable number.

806215679977 is a deficient number, since it is larger than the sum of its proper divisors (1).

806215679977 is an equidigital number, since it uses as much as digits as its factorization.

806215679977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80015040, while the sum is 67.

The spelling of 806215679977 in words is "eight hundred six billion, two hundred fifteen million, six hundred seventy-nine thousand, nine hundred seventy-seven".