12534215511 has 4 divisors (see below), whose sum is σ = 16712287352. Its totient is φ = 8356143672.

The previous prime is 12534215509. The next prime is 12534215569. The reversal of 12534215511 is 11551243521.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12534215511 - 2¹ = 12534215509 is a prime.

It is a super-2 number, since 2×12534215511² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12534215581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2089035916 + ... + 2089035921.

It is an arithmetic number, because the mean of its divisors is an integer number (4178071838).

Almost surely, 2^12534215511 is an apocalyptic number.

12534215511 is a deficient number, since it is larger than the sum of its proper divisors (4178071841).

12534215511 is an equidigital number, since it uses as much as digits as its factorization.

12534215511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4178071840.

The product of its digits is 6000, while the sum is 30.

The spelling of 12534215511 in words is "twelve billion, five hundred thirty-four million, two hundred fifteen thousand, five hundred eleven".