766868661 has 16 divisors (see below), whose sum is σ = 1223494720. Its totient is φ = 471918960.

The previous prime is 766868651. The next prime is 766868693. The reversal of 766868661 is 166868667.

It is not a de Polignac number, because 766868661 - 2¹⁹ = 766344373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 766868598 and 766868607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766868611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1092055 + ... + 1092756.

It is an arithmetic number, because the mean of its divisors is an integer number (76468420).

Almost surely, 2^766868661 is an apocalyptic number.

It is an amenable number.

766868661 is a deficient number, since it is larger than the sum of its proper divisors (456626059).

766868661 is a wasteful number, since it uses less digits than its factorization.

766868661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184833 (or 2184827 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 766868661 is about 27692.3935585207. The cubic root of 766868661 is about 915.3214994927.

The spelling of 766868661 in words is "seven hundred sixty-six million, eight hundred sixty-eight thousand, six hundred sixty-one".