16193537881 has 4 divisors (see below), whose sum is σ = 16213506064. Its totient is φ = 16173569700.

The previous prime is 16193537879. The next prime is 16193537891. The reversal of 16193537881 is 18873539161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16193537881 - 2¹ = 16193537879 is a prime.

It is a super-2 number, since 2×16193537881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16193537891) 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 in 3 ways as a sum of consecutive naturals, for example, 9982875 + ... + 9984496.

It is an arithmetic number, because the mean of its divisors is an integer number (4053376516).

Almost surely, 2^16193537881 is an apocalyptic number.

It is an amenable number.

16193537881 is a deficient number, since it is larger than the sum of its proper divisors (19968183).

16193537881 is an equidigital number, since it uses as much as digits as its factorization.

16193537881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19968182.

The product of its digits is 1088640, while the sum is 52.

The spelling of 16193537881 in words is "sixteen billion, one hundred ninety-three million, five hundred thirty-seven thousand, eight hundred eighty-one".