13535621525 has 12 divisors (see below), whose sum is σ = 16790570052. Its totient is φ = 10824368640.

The previous prime is 13535621507. The next prime is 13535621531. The reversal of 13535621525 is 52512653531.

It can be written as a sum of positive squares in 6 ways, for example, as 358647844 + 13176973681 = 18938^2 + 114791^2 .

It is not a de Polignac number, because 13535621525 - 2¹⁴ = 13535605141 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35462 + ... + 168311.

It is an arithmetic number, because the mean of its divisors is an integer number (1399214171).

Almost surely, 2^13535621525 is an apocalyptic number.

It is an amenable number.

13535621525 is a deficient number, since it is larger than the sum of its proper divisors (3254948527).

13535621525 is a wasteful number, since it uses less digits than its factorization.

13535621525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206440 (or 206435 counting only the distinct ones).

The product of its digits is 135000, while the sum is 38.

The spelling of 13535621525 in words is "thirteen billion, five hundred thirty-five million, six hundred twenty-one thousand, five hundred twenty-five".