1406166506666 has 12 divisors (see below), whose sum is σ = 2149797823782. Its totient is φ = 689817528816.

The previous prime is 1406166506659. The next prime is 1406166506687. The reversal of 1406166506666 is 6666056616041.

It can be written as a sum of positive squares in 3 ways, for example, as 1120695359641 + 285471147025 = 1058629^2 + 534295^2 .

It is a Harshad number since it is a multiple of its sum of digits (53).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 125142701 + ... + 125153936.

Almost surely, 2^{1406166506666} is an apocalyptic number.

1406166506666 is a deficient number, since it is larger than the sum of its proper divisors (743631317116).

1406166506666 is an equidigital number, since it uses as much as digits as its factorization.

1406166506666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250296745 (or 250296692 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 53.

The spelling of 1406166506666 in words is "one trillion, four hundred six billion, one hundred sixty-six million, five hundred six thousand, six hundred sixty-six".