261009161233 has 2 divisors, whose sum is σ = 261009161234. Its totient is φ = 261009161232.

The previous prime is 261009161197. The next prime is 261009161267. The reversal of 261009161233 is 332161900162.

It is an a-pointer prime, because the next prime (261009161267) can be obtained adding 261009161233 to its sum of digits (34).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223660893184 + 37348268049 = 472928^2 + 193257^2 .

It is a cyclic number.

It is not a de Polignac number, because 261009161233 - 2⁹ = 261009160721 is a prime.

It is not a weakly prime, because it can be changed into another prime (261009167233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130504580616 + 130504580617.

It is an arithmetic number, because the mean of its divisors is an integer number (130504580617).

Almost surely, 2^261009161233 is an apocalyptic number.

It is an amenable number.

261009161233 is a deficient number, since it is larger than the sum of its proper divisors (1).

261009161233 is an equidigital number, since it uses as much as digits as its factorization.

261009161233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 261009161233 in words is "two hundred sixty-one billion, nine million, one hundred sixty-one thousand, two hundred thirty-three".