766394689 has 2 divisors, whose sum is σ = 766394690. Its totient is φ = 766394688.

The previous prime is 766394641. The next prime is 766394711. The reversal of 766394689 is 986493667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 720385600 + 46009089 = 26840^2 + 6783^2 .

It is a cyclic number.

It is not a de Polignac number, because 766394689 - 2²¹ = 764297537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (766394389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383197344 + 383197345.

It is an arithmetic number, because the mean of its divisors is an integer number (383197345).

Almost surely, 2^766394689 is an apocalyptic number.

It is an amenable number.

766394689 is a deficient number, since it is larger than the sum of its proper divisors (1).

766394689 is an equidigital number, since it uses as much as digits as its factorization.

766394689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 58.

The square root of 766394689 is about 27683.8344345577. The cubic root of 766394689 is about 915.1328856340.

The spelling of 766394689 in words is "seven hundred sixty-six million, three hundred ninety-four thousand, six hundred eighty-nine".