16491845939 has 4 divisors (see below), whose sum is σ = 16526276160. Its totient is φ = 16457415720.

The previous prime is 16491845921. The next prime is 16491845941. The reversal of 16491845939 is 93954819461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93954819461 = 45413 ⋅2068897.

It is a cyclic number.

It is not a de Polignac number, because 16491845939 - 2²⁴ = 16475068723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16491845989) 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, 17214392 + ... + 17215349.

It is an arithmetic number, because the mean of its divisors is an integer number (4131569040).

Almost surely, 2^16491845939 is an apocalyptic number.

16491845939 is a deficient number, since it is larger than the sum of its proper divisors (34430221).

16491845939 is an equidigital number, since it uses as much as digits as its factorization.

16491845939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34430220.

The product of its digits is 8398080, while the sum is 59.

The spelling of 16491845939 in words is "sixteen billion, four hundred ninety-one million, eight hundred forty-five thousand, nine hundred thirty-nine".