766216709 has 2 divisors, whose sum is σ = 766216710. Its totient is φ = 766216708.

The previous prime is 766216697. The next prime is 766216721. The reversal of 766216709 is 907612667.

It is a balanced prime because it is at equal distance from previous prime (766216697) and next prime (766216721).

It can be written as a sum of positive squares in only one way, i.e., 751966084 + 14250625 = 27422^2 + 3775^2 .

It is a cyclic number.

It is not a de Polignac number, because 766216709 - 2¹⁶ = 766151173 is a prime.

It is equal to p_39495806 and since 766216709 and 39495806 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 766216709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766216799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383108354 + 383108355.

It is an arithmetic number, because the mean of its divisors is an integer number (383108355).

Almost surely, 2^766216709 is an apocalyptic number.

It is an amenable number.

766216709 is a deficient number, since it is larger than the sum of its proper divisors (1).

766216709 is an equidigital number, since it uses as much as digits as its factorization.

766216709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 766216709 is about 27680.6197365594. The cubic root of 766216709 is about 915.0620396486.

The spelling of 766216709 in words is "seven hundred sixty-six million, two hundred sixteen thousand, seven hundred nine".