13553638261 has 2 divisors, whose sum is σ = 13553638262. Its totient is φ = 13553638260.

The previous prime is 13553638187. The next prime is 13553638349. The reversal of 13553638261 is 16283635531.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13158384100 + 395254161 = 114710^2 + 19881^2 .

It is a cyclic number.

It is not a de Polignac number, because 13553638261 - 2⁹ = 13553637749 is a prime.

It is a super-2 number, since 2×13553638261² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13553638361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6776819130 + 6776819131.

It is an arithmetic number, because the mean of its divisors is an integer number (6776819131).

Almost surely, 2^13553638261 is an apocalyptic number.

It is an amenable number.

13553638261 is a deficient number, since it is larger than the sum of its proper divisors (1).

13553638261 is an equidigital number, since it uses as much as digits as its factorization.

13553638261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 43.

The spelling of 13553638261 in words is "thirteen billion, five hundred fifty-three million, six hundred thirty-eight thousand, two hundred sixty-one".