13618858261 has 2 divisors, whose sum is σ = 13618858262. Its totient is φ = 13618858260.

The previous prime is 13618858259. The next prime is 13618858271. The reversal of 13618858261 is 16285881631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12520267236 + 1098591025 = 111894^2 + 33145^2 .

It is a cyclic number.

It is not a de Polignac number, because 13618858261 - 2¹ = 13618858259 is a prime.

Together with 13618858259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13618858271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6809429130 + 6809429131.

It is an arithmetic number, because the mean of its divisors is an integer number (6809429131).

Almost surely, 2^13618858261 is an apocalyptic number.

It is an amenable number.

13618858261 is a deficient number, since it is larger than the sum of its proper divisors (1).

13618858261 is an equidigital number, since it uses as much as digits as its factorization.

13618858261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 49.

The spelling of 13618858261 in words is "thirteen billion, six hundred eighteen million, eight hundred fifty-eight thousand, two hundred sixty-one".