13641225138 has 18 divisors (see below), whose sum is σ = 29557061469. Its totient is φ = 4546909872.

The previous prime is 13641225131. The next prime is 13641225149. The reversal of 13641225138 is 83152214631.

13641225138 is a `hidden beast` number, since 1 + 3 + 641 + 2 + 2 + 5 + 1 + 3 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13325700969 + 315524169 = 115437^2 + 17763^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=82587.

It is not an unprimeable number, because it can be changed into a prime (13641225131) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 481758 + ... + 509286.

Almost surely, 2^13641225138 is an apocalyptic number.

13641225138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13641225138 is an abundant number, since it is smaller than the sum of its proper divisors (15915836331).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13641225138 is an frugal number, since it uses more digits than its factorization.

13641225138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55066 (or 27534 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

Adding to 13641225138 its reverse (83152214631), we get a palindrome (96793439769).

The spelling of 13641225138 in words is "thirteen billion, six hundred forty-one million, two hundred twenty-five thousand, one hundred thirty-eight".