16520274718261 has 4 divisors (see below), whose sum is σ = 16520840103724. Its totient is φ = 16519709332800.

The previous prime is 16520274718187. The next prime is 16520274718289. The reversal of 16520274718261 is 16281747202561.

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 6865023574161 + 9655251144100 = 2620119^2 + 3107290^2 .

It is a cyclic number.

It is not a de Polignac number, because 16520274718261 - 2¹⁷ = 16520274587189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16520274718199 and 16520274718208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16520274718291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282648900 + ... + 282707341.

It is an arithmetic number, because the mean of its divisors is an integer number (4130210025931).

Almost surely, 2^{16520274718261} is an apocalyptic number.

It is an amenable number.

16520274718261 is a deficient number, since it is larger than the sum of its proper divisors (565385463).

16520274718261 is an equidigital number, since it uses as much as digits as its factorization.

16520274718261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565385462.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The spelling of 16520274718261 in words is "sixteen trillion, five hundred twenty billion, two hundred seventy-four million, seven hundred eighteen thousand, two hundred sixty-one".