16661140243301 has 4 divisors (see below), whose sum is σ = 16661156736204. Its totient is φ = 16661123750400.

The previous prime is 16661140243291. The next prime is 16661140243337. The reversal of 16661140243301 is 10334204116661.

16661140243301 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9573139214401 + 7088001028900 = 3094049^2 + 2662330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16661140243301 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 (16661140243361) 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, 6624860 + ... + 8786981.

It is an arithmetic number, because the mean of its divisors is an integer number (4165289184051).

Almost surely, 2^{16661140243301} is an apocalyptic number.

It is an amenable number.

16661140243301 is a deficient number, since it is larger than the sum of its proper divisors (16492903).

16661140243301 is a wasteful number, since it uses less digits than its factorization.

16661140243301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16492902.

The product of its (nonzero) digits is 62208, while the sum is 38.

Adding to 16661140243301 its reverse (10334204116661), we get a palindrome (26995344359962).

The spelling of 16661140243301 in words is "sixteen trillion, six hundred sixty-one billion, one hundred forty million, two hundred forty-three thousand, three hundred one".