66661488416666 has 64 divisors (see below), whose sum is σ = 121265656243200. Its totient is φ = 27066976934400.

The previous prime is 66661488416647. The next prime is 66661488416671.

66661488416666 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66661488416593 and 66661488416602.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 734848520 + ... + 734939228.

It is an arithmetic number, because the mean of its divisors is an integer number (1894775878800).

Almost surely, 2^{66661488416666} is an apocalyptic number.

66661488416666 is a deficient number, since it is larger than the sum of its proper divisors (54604167826534).

66661488416666 is a wasteful number, since it uses less digits than its factorization.

66661488416666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173655.

The product of its digits is 1719926784, while the sum is 74.

The spelling of 66661488416666 in words is "sixty-six trillion, six hundred sixty-one billion, four hundred eighty-eight million, four hundred sixteen thousand, six hundred sixty-six".