261501543261316 has 12 divisors (see below), whose sum is σ = 457628410668240. Its totient is φ = 130750568784680.

The previous prime is 261501543261289. The next prime is 261501543261319. The reversal of 261501543261316 is 613162345105162.

It is not an unprimeable number, because it can be changed into a prime (261501543261319) 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, 47792206 + ... + 52982053.

It is an arithmetic number, because the mean of its divisors is an integer number (38135700889020).

Almost surely, 2^{261501543261316} is an apocalyptic number.

It is an amenable number.

261501543261316 is a deficient number, since it is larger than the sum of its proper divisors (196126867406924).

261501543261316 is a wasteful number, since it uses less digits than its factorization.

261501543261316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101422994 (or 101422992 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 46.

Adding to 261501543261316 its reverse (613162345105162), we get a palindrome (874663888366478).

The spelling of 261501543261316 in words is "two hundred sixty-one trillion, five hundred one billion, five hundred forty-three million, two hundred sixty-one thousand, three hundred sixteen".