1661323416013 has 16 divisors (see below), whose sum is σ = 1760066280000. Its totient is φ = 1563712929792.

The previous prime is 1661323415989. The next prime is 1661323416017. The reversal of 1661323416013 is 3106143231661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1661323416013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661323416017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43828173 + ... + 43866061.

It is an arithmetic number, because the mean of its divisors is an integer number (110004142500).

Almost surely, 2^{1661323416013} is an apocalyptic number.

It is an amenable number.

1661323416013 is a deficient number, since it is larger than the sum of its proper divisors (98742863987).

1661323416013 is a wasteful number, since it uses less digits than its factorization.

1661323416013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52764.

The product of its (nonzero) digits is 46656, while the sum is 37.

Adding to 1661323416013 its reverse (3106143231661), we get a palindrome (4767466647674).

The spelling of 1661323416013 in words is "one trillion, six hundred sixty-one billion, three hundred twenty-three million, four hundred sixteen thousand, thirteen".