66016001813 has 4 divisors (see below), whose sum is σ = 66018608460. Its totient is φ = 66013395168.

The previous prime is 66016001803. The next prime is 66016001833. The reversal of 66016001813 is 31810061066.

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 29425285444 + 36590716369 = 171538^2 + 191287^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66016001813 is a prime.

It is a super-2 number, since 2×66016001813² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66016001813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66016001803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1264958 + ... + 1316111.

It is an arithmetic number, because the mean of its divisors is an integer number (16504652115).

Almost surely, 2^66016001813 is an apocalyptic number.

It is an amenable number.

66016001813 is a deficient number, since it is larger than the sum of its proper divisors (2606647).

66016001813 is a wasteful number, since it uses less digits than its factorization.

66016001813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606646.

The product of its (nonzero) digits is 5184, while the sum is 32.

Adding to 66016001813 its reverse (31810061066), we get a palindrome (97826062879).

The spelling of 66016001813 in words is "sixty-six billion, sixteen million, one thousand, eight hundred thirteen".