16287278261 has 4 divisors (see below), whose sum is σ = 16594585452. Its totient is φ = 15979971072.

The previous prime is 16287278257. The next prime is 16287278269.

16287278261 is nontrivially palindromic in base 10.

16287278261 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.

It can be written as a sum of positive squares in 2 ways, for example, as 6160680100 + 10126598161 = 78490^2 + 100631^2 .

It is a cyclic number.

It is not a de Polignac number, because 16287278261 - 2² = 16287278257 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 (16287278269) 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, 153653516 + ... + 153653621.

It is an arithmetic number, because the mean of its divisors is an integer number (4148646363).

Almost surely, 2^16287278261 is an apocalyptic number.

It is an amenable number.

16287278261 is a deficient number, since it is larger than the sum of its proper divisors (307307191).

16287278261 is an equidigital number, since it uses as much as digits as its factorization.

16287278261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307307190.

The product of its digits is 903168, while the sum is 50.

The spelling of 16287278261 in words is "sixteen billion, two hundred eighty-seven million, two hundred seventy-eight thousand, two hundred sixty-one".