16581872837 has 2 divisors, whose sum is σ = 16581872838. Its totient is φ = 16581872836.

The previous prime is 16581872821. The next prime is 16581872873. The reversal of 16581872837 is 73827818561.

Together with next prime (16581872873) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15387410116 + 1194462721 = 124046^2 + 34561^2 .

It is a cyclic number.

It is not a de Polignac number, because 16581872837 - 2⁴ = 16581872821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16581872537) by changing a digit.

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 as a sum of consecutive naturals, namely, 8290936418 + 8290936419.

It is an arithmetic number, because the mean of its divisors is an integer number (8290936419).

Almost surely, 2^16581872837 is an apocalyptic number.

It is an amenable number.

16581872837 is a deficient number, since it is larger than the sum of its proper divisors (1).

16581872837 is an equidigital number, since it uses as much as digits as its factorization.

16581872837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4515840, while the sum is 56.

The spelling of 16581872837 in words is "sixteen billion, five hundred eighty-one million, eight hundred seventy-two thousand, eight hundred thirty-seven".