806756643761 has 2 divisors, whose sum is σ = 806756643762. Its totient is φ = 806756643760.

The previous prime is 806756643757. The next prime is 806756643817. The reversal of 806756643761 is 167346657608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 699406053025 + 107350590736 = 836305^2 + 327644^2 .

It is a cyclic number.

It is not a de Polignac number, because 806756643761 - 2² = 806756643757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 806756643761.

It is not a weakly prime, because it can be changed into another prime (806756643701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403378321880 + 403378321881.

It is an arithmetic number, because the mean of its divisors is an integer number (403378321881).

Almost surely, 2^806756643761 is an apocalyptic number.

It is an amenable number.

806756643761 is a deficient number, since it is larger than the sum of its proper divisors (1).

806756643761 is an equidigital number, since it uses as much as digits as its factorization.

806756643761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30481920, while the sum is 59.

The spelling of 806756643761 in words is "eight hundred six billion, seven hundred fifty-six million, six hundred forty-three thousand, seven hundred sixty-one".