261041818326 has 16 divisors (see below), whose sum is σ = 552794439024. Its totient is φ = 81895472384.

The previous prime is 261041818321. The next prime is 261041818361. The reversal of 261041818326 is 623818140162.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261041818321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1279616655 + ... + 1279616858.

It is an arithmetic number, because the mean of its divisors is an integer number (34549652439).

Almost surely, 2^261041818326 is an apocalyptic number.

261041818326 is an abundant number, since it is smaller than the sum of its proper divisors (291752620698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261041818326 is a wasteful number, since it uses less digits than its factorization.

261041818326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2559233535.

The product of its (nonzero) digits is 110592, while the sum is 42.

Adding to 261041818326 its reverse (623818140162), we get a palindrome (884859958488).

The spelling of 261041818326 in words is "two hundred sixty-one billion, forty-one million, eight hundred eighteen thousand, three hundred twenty-six".