12135145534 has 4 divisors (see below), whose sum is σ = 18202718304. Its totient is φ = 6067572766.

The previous prime is 12135145493. The next prime is 12135145537. The reversal of 12135145534 is 43554153121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43554153121 = 29 ⋅1501867349.

It is a self number, because there is not a number n which added to its sum of digits gives 12135145534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12135145537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3033786382 + ... + 3033786385.

It is an arithmetic number, because the mean of its divisors is an integer number (4550679576).

Almost surely, 2^12135145534 is an apocalyptic number.

12135145534 is a deficient number, since it is larger than the sum of its proper divisors (6067572770).

12135145534 is an equidigital number, since it uses as much as digits as its factorization.

12135145534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6067572769.

The product of its digits is 36000, while the sum is 34.

Adding to 12135145534 its reverse (43554153121), we get a palindrome (55689298655).

The spelling of 12135145534 in words is "twelve billion, one hundred thirty-five million, one hundred forty-five thousand, five hundred thirty-four".