13634521253 has 2 divisors, whose sum is σ = 13634521254. Its totient is φ = 13634521252.

The previous prime is 13634521223. The next prime is 13634521267. The reversal of 13634521253 is 35212543631.

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., 9579124129 + 4055397124 = 97873^2 + 63682^2 .

It is a cyclic number.

It is not a de Polignac number, because 13634521253 - 2⁶ = 13634521189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13634521223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6817260626 + 6817260627.

It is an arithmetic number, because the mean of its divisors is an integer number (6817260627).

Almost surely, 2^13634521253 is an apocalyptic number.

It is an amenable number.

13634521253 is a deficient number, since it is larger than the sum of its proper divisors (1).

13634521253 is an equidigital number, since it uses as much as digits as its factorization.

13634521253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 35.

The spelling of 13634521253 in words is "thirteen billion, six hundred thirty-four million, five hundred twenty-one thousand, two hundred fifty-three".