12535265521 has 9 divisors (see below), whose sum is σ = 12669804441. Its totient is φ = 12402143892.

The previous prime is 12535265507. The next prime is 12535265527. The reversal of 12535265521 is 12556253521.

The square root of 12535265521 is 111961.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 12535265521 - 2¹⁷ = 12535134449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12535265527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11531440 + ... + 11532526.

It is an arithmetic number, because the mean of its divisors is an integer number (1407756049).

Almost surely, 2^12535265521 is an apocalyptic number.

12535265521 is the 111961-st square number.

12535265521 is the 55981-st centered octagonal number.

It is an amenable number.

12535265521 is a deficient number, since it is larger than the sum of its proper divisors (134538920).

12535265521 is an frugal number, since it uses more digits than its factorization.

12535265521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380 (or 1190 counting only the distinct ones).

The product of its digits is 90000, while the sum is 37.

The spelling of 12535265521 in words is "twelve billion, five hundred thirty-five million, two hundred sixty-five thousand, five hundred twenty-one".