666487784666 has 32 divisors (see below), whose sum is σ = 1129769907840. Its totient is φ = 292239059200.

The previous prime is 666487784663. The next prime is 666487784671.

666487784666 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 666487784593 and 666487784602.

It is not an unprimeable number, because it can be changed into a prime (666487784663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4070846 + ... + 4231401.

It is an arithmetic number, because the mean of its divisors is an integer number (35305309620).

Almost surely, 2^666487784666 is an apocalyptic number.

666487784666 is a deficient number, since it is larger than the sum of its proper divisors (463282123174).

666487784666 is a wasteful number, since it uses less digits than its factorization.

666487784666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8302390.

The product of its digits is 2341011456, while the sum is 74.

The spelling of 666487784666 in words is "six hundred sixty-six billion, four hundred eighty-seven million, seven hundred eighty-four thousand, six hundred sixty-six".