840166477 has 2 divisors, whose sum is σ = 840166478. Its totient is φ = 840166476.

The previous prime is 840166447. The next prime is 840166493. The reversal of 840166477 is 774661048.

840166477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 825642756 + 14523721 = 28734^2 + 3811^2 .

It is a cyclic number.

It is not a de Polignac number, because 840166477 - 2¹⁵ = 840133709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840166427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420083238 + 420083239.

It is an arithmetic number, because the mean of its divisors is an integer number (420083239).

Almost surely, 2^840166477 is an apocalyptic number.

It is an amenable number.

840166477 is a deficient number, since it is larger than the sum of its proper divisors (1).

840166477 is an equidigital number, since it uses as much as digits as its factorization.

840166477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 840166477 is about 28985.6253511978. The cubic root of 840166477 is about 943.6011242904.

The spelling of 840166477 in words is "eight hundred forty million, one hundred sixty-six thousand, four hundred seventy-seven".