13161253521 has 16 divisors (see below), whose sum is σ = 18906241536. Its totient is φ = 8095790976.

The previous prime is 13161253519. The next prime is 13161253529. The reversal of 13161253521 is 12535216131.

It is not a de Polignac number, because 13161253521 - 2¹ = 13161253519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13161253529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22816 + ... + 163838.

It is an arithmetic number, because the mean of its divisors is an integer number (1181640096).

Almost surely, 2^13161253521 is an apocalyptic number.

It is an amenable number.

13161253521 is a deficient number, since it is larger than the sum of its proper divisors (5744988015).

13161253521 is a wasteful number, since it uses less digits than its factorization.

13161253521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143432.

The product of its digits is 5400, while the sum is 30.

Adding to 13161253521 its reverse (12535216131), we get a palindrome (25696469652).

The spelling of 13161253521 in words is "thirteen billion, one hundred sixty-one million, two hundred fifty-three thousand, five hundred twenty-one".