84428720066 has 16 divisors (see below), whose sum is σ = 134895632256. Its totient is φ = 39493248576.

The previous prime is 84428720027. The next prime is 84428720141. The reversal of 84428720066 is 66002782448.

It is a self number, because there is not a number n which added to its sum of digits gives 84428720066.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7429046 + ... + 7440401.

It is an arithmetic number, because the mean of its divisors is an integer number (8430977016).

Almost surely, 2^84428720066 is an apocalyptic number.

84428720066 is a deficient number, since it is larger than the sum of its proper divisors (50466912190).

84428720066 is a wasteful number, since it uses less digits than its factorization.

84428720066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14869633.

The product of its (nonzero) digits is 1032192, while the sum is 47.

The spelling of 84428720066 in words is "eighty-four billion, four hundred twenty-eight million, seven hundred twenty thousand, sixty-six".