16278921277 has 4 divisors (see below), whose sum is σ = 16840263420. Its totient is φ = 15717579136.

The previous prime is 16278921271. The next prime is 16278921287. The reversal of 16278921277 is 77212987261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77212987261 = 45667 ⋅1690783.

It can be written as a sum of positive squares in 2 ways, for example, as 7960386841 + 8318534436 = 89221^2 + 91206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16278921277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16278921271) 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, 280671028 + ... + 280671085.

It is an arithmetic number, because the mean of its divisors is an integer number (4210065855).

Almost surely, 2^16278921277 is an apocalyptic number.

It is an amenable number.

16278921277 is a deficient number, since it is larger than the sum of its proper divisors (561342143).

16278921277 is an equidigital number, since it uses as much as digits as its factorization.

16278921277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561342142.

The product of its digits is 1185408, while the sum is 52.

The spelling of 16278921277 in words is "sixteen billion, two hundred seventy-eight million, nine hundred twenty-one thousand, two hundred seventy-seven".