771136766721 has 6 divisors (see below), whose sum is σ = 1113864218610. Its totient is φ = 514091177808.

The previous prime is 771136766711. The next prime is 771136766789. The reversal of 771136766721 is 127667631177.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 758007044496 + 13129722225 = 870636^2 + 114585^2 .

It is not a de Polignac number, because 771136766721 - 2⁹ = 771136766209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (771136766711) 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 in 5 ways as a sum of consecutive naturals, for example, 42840931476 + ... + 42840931493.

It is an arithmetic number, because the mean of its divisors is an integer number (185644036435).

Almost surely, 2^771136766721 is an apocalyptic number.

It is an amenable number.

771136766721 is a deficient number, since it is larger than the sum of its proper divisors (342727451889).

771136766721 is a wasteful number, since it uses less digits than its factorization.

771136766721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85681862975 (or 85681862972 counting only the distinct ones).

The product of its digits is 3111696, while the sum is 54.

The spelling of 771136766721 in words is "seven hundred seventy-one billion, one hundred thirty-six million, seven hundred sixty-six thousand, seven hundred twenty-one".