261011068321 has 2 divisors, whose sum is σ = 261011068322. Its totient is φ = 261011068320.

The previous prime is 261011068309. The next prime is 261011068333. The reversal of 261011068321 is 123860110162.

It is a balanced prime because it is at equal distance from previous prime (261011068309) and next prime (261011068333).

It can be written as a sum of positive squares in only one way, i.e., 245060641296 + 15950427025 = 495036^2 + 126295^2 .

It is a cyclic number.

It is not a de Polignac number, because 261011068321 - 2⁹ = 261011067809 is a prime.

It is not a weakly prime, because it can be changed into another prime (261011062321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130505534160 + 130505534161.

It is an arithmetic number, because the mean of its divisors is an integer number (130505534161).

Almost surely, 2^261011068321 is an apocalyptic number.

It is an amenable number.

261011068321 is a deficient number, since it is larger than the sum of its proper divisors (1).

261011068321 is an equidigital number, since it uses as much as digits as its factorization.

261011068321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

Adding to 261011068321 its reverse (123860110162), we get a palindrome (384871178483).

The spelling of 261011068321 in words is "two hundred sixty-one billion, eleven million, sixty-eight thousand, three hundred twenty-one".