13440140261 has 2 divisors, whose sum is σ = 13440140262. Its totient is φ = 13440140260.

The previous prime is 13440140213. The next prime is 13440140267. The reversal of 13440140261 is 16204104431.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8609056225 + 4831084036 = 92785^2 + 69506^2 .

It is a cyclic number.

It is not a de Polignac number, because 13440140261 - 2¹⁴ = 13440123877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13440140261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13440140267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6720070130 + 6720070131.

It is an arithmetic number, because the mean of its divisors is an integer number (6720070131).

Almost surely, 2^13440140261 is an apocalyptic number.

It is an amenable number.

13440140261 is a deficient number, since it is larger than the sum of its proper divisors (1).

13440140261 is an equidigital number, since it uses as much as digits as its factorization.

13440140261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 13440140261 its reverse (16204104431), we get a palindrome (29644244692).

The spelling of 13440140261 in words is "thirteen billion, four hundred forty million, one hundred forty thousand, two hundred sixty-one".