1681407344066 has 8 divisors (see below), whose sum is σ = 2547082412604. Its totient is φ = 832379873200.

The previous prime is 1681407344063. The next prime is 1681407344131. The reversal of 1681407344066 is 6604437041861.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1594045128025 + 87362216041 = 1262555^2 + 295571^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1681407344063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4161899165 + ... + 4161899568.

Almost surely, 2^{1681407344066} is an apocalyptic number.

1681407344066 is a deficient number, since it is larger than the sum of its proper divisors (865675068538).

1681407344066 is a wasteful number, since it uses less digits than its factorization.

1681407344066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8323798836.

The product of its (nonzero) digits is 2322432, while the sum is 50.

The spelling of 1681407344066 in words is "one trillion, six hundred eighty-one billion, four hundred seven million, three hundred forty-four thousand, sixty-six".