840666771 has 12 divisors (see below), whose sum is σ = 1387767472. Its totient is φ = 480380976.

The previous prime is 840666737. The next prime is 840666817. The reversal of 840666771 is 177666048.

840666771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 840666771 - 2⁶ = 840666707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (840666731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6671896 + ... + 6672021.

Almost surely, 2^840666771 is an apocalyptic number.

840666771 is a deficient number, since it is larger than the sum of its proper divisors (547100701).

840666771 is a wasteful number, since it uses less digits than its factorization.

840666771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13343930 (or 13343927 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 840666771 is about 28994.2541031840. The cubic root of 840666771 is about 943.7883825391.

The spelling of 840666771 in words is "eight hundred forty million, six hundred sixty-six thousand, seven hundred seventy-one".