84666779 has 2 divisors, whose sum is σ = 84666780. Its totient is φ = 84666778.

The previous prime is 84666737. The next prime is 84666823. The reversal of 84666779 is 97766648.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84666779 - 2⁸ = 84666523 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84666779.

It is not a weakly prime, because it can be changed into another prime (84662779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42333389 + 42333390.

It is an arithmetic number, because the mean of its divisors is an integer number (42333390).

Almost surely, 2^84666779 is an apocalyptic number.

84666779 is a deficient number, since it is larger than the sum of its proper divisors (1).

84666779 is an equidigital number, since it uses as much as digits as its factorization.

84666779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 53.

The square root of 84666779 is about 9201.4552653371. The cubic root of 84666779 is about 439.1076594904.

The spelling of 84666779 in words is "eighty-four million, six hundred sixty-six thousand, seven hundred seventy-nine".