766691801 has 2 divisors, whose sum is σ = 766691802. Its totient is φ = 766691800.

The previous prime is 766691797. The next prime is 766691813. The reversal of 766691801 is 108196667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 733109776 + 33582025 = 27076^2 + 5795^2 .

It is an emirp because it is prime and its reverse (108196667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 766691801 - 2² = 766691797 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (766691881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383345900 + 383345901.

It is an arithmetic number, because the mean of its divisors is an integer number (383345901).

Almost surely, 2^766691801 is an apocalyptic number.

766691801 is the 14801-st centered heptagonal number.

It is an amenable number.

766691801 is a deficient number, since it is larger than the sum of its proper divisors (1).

766691801 is an equidigital number, since it uses as much as digits as its factorization.

766691801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 766691801 is about 27689.2000787311. The cubic root of 766691801 is about 915.2511283783.

The spelling of 766691801 in words is "seven hundred sixty-six million, six hundred ninety-one thousand, eight hundred one".