666785411666 has 16 divisors (see below), whose sum is σ = 1092724678368. Its totient is φ = 302633923200.

The previous prime is 666785411657. The next prime is 666785411689. The reversal of 666785411666 is 666114587666.

It is a junction number, because it is equal to n+sod(n) for n = 666785411599 and 666785411608.

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, 22502600 + ... + 22532211.

It is an arithmetic number, because the mean of its divisors is an integer number (68295292398).

Almost surely, 2^666785411666 is an apocalyptic number.

666785411666 is a deficient number, since it is larger than the sum of its proper divisors (425939266702).

666785411666 is a wasteful number, since it uses less digits than its factorization.

666785411666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45035497.

The product of its digits is 52254720, while the sum is 62.

The spelling of 666785411666 in words is "six hundred sixty-six billion, seven hundred eighty-five million, four hundred eleven thousand, six hundred sixty-six".