766971649 has 2 divisors, whose sum is σ = 766971650. Its totient is φ = 766971648.

The previous prime is 766971619. The next prime is 766971683. The reversal of 766971649 is 946179667.

766971649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 486643600 + 280328049 = 22060^2 + 16743^2 .

It is a cyclic number.

It is not a de Polignac number, because 766971649 - 2¹⁹ = 766447361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 766971649.

It is not a weakly prime, because it can be changed into another prime (766971619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383485824 + 383485825.

It is an arithmetic number, because the mean of its divisors is an integer number (383485825).

Almost surely, 2^766971649 is an apocalyptic number.

It is an amenable number.

766971649 is a deficient number, since it is larger than the sum of its proper divisors (1).

766971649 is an equidigital number, since it uses as much as digits as its factorization.

766971649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3429216, while the sum is 55.

The square root of 766971649 is about 27694.2529958835. The cubic root of 766971649 is about 915.3624725718.

The spelling of 766971649 in words is "seven hundred sixty-six million, nine hundred seventy-one thousand, six hundred forty-nine".