16044564881 has 4 divisors (see below), whose sum is σ = 16069518192. Its totient is φ = 16019611572.

The previous prime is 16044564859. The next prime is 16044564883. The reversal of 16044564881 is 18846544061.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18846544061 = 1061 ⋅17763001.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16044564881 is a prime.

It is a super-2 number, since 2×16044564881² (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 (16044564883) 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, 12475691 + ... + 12476976.

It is an arithmetic number, because the mean of its divisors is an integer number (4017379548).

Almost surely, 2^16044564881 is an apocalyptic number.

It is an amenable number.

16044564881 is a deficient number, since it is larger than the sum of its proper divisors (24953311).

16044564881 is an equidigital number, since it uses as much as digits as its factorization.

16044564881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24953310.

The product of its (nonzero) digits is 737280, while the sum is 47.

The spelling of 16044564881 in words is "sixteen billion, forty-four million, five hundred sixty-four thousand, eight hundred eighty-one".