16489916777 has 4 divisors (see below), whose sum is σ = 16490178900. Its totient is φ = 16489654656.

The previous prime is 16489916767. The next prime is 16489916827. The reversal of 16489916777 is 77761998461.

16489916777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 77761998461 = 7 ⋅11108856923.

It can be written as a sum of positive squares in 2 ways, for example, as 2826410896 + 13663505881 = 53164^2 + 116891^2 .

It is a cyclic number.

It is not a de Polignac number, because 16489916777 - 2⁴ = 16489916761 is a prime.

It is a deceptive number, since it divides R_16489916776.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16489916747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26213 + ... + 183485.

It is an arithmetic number, because the mean of its divisors is an integer number (4122544725).

Almost surely, 2^16489916777 is an apocalyptic number.

16489916777 is the 104849-th pentagonal number.

It is an amenable number.

16489916777 is a deficient number, since it is larger than the sum of its proper divisors (262123).

16489916777 is a wasteful number, since it uses less digits than its factorization.

16489916777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262122.

The product of its digits is 32006016, while the sum is 65.

The spelling of 16489916777 in words is "sixteen billion, four hundred eighty-nine million, nine hundred sixteen thousand, seven hundred seventy-seven".