12135253115505 has 128 divisors (see below), whose sum is σ = 22929516288000. Its totient is φ = 5428204001280.

The previous prime is 12135253115477. The next prime is 12135253115561. The reversal of 12135253115505 is 50551135253121.

It is not a de Polignac number, because 12135253115505 - 2¹¹ = 12135253113457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8285386 + ... + 9639404.

It is an arithmetic number, because the mean of its divisors is an integer number (179136846000).

Almost surely, 2^{12135253115505} is an apocalyptic number.

12135253115505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12135253115505 is a deficient number, since it is larger than the sum of its proper divisors (10794263172495).

12135253115505 is a wasteful number, since it uses less digits than its factorization.

12135253115505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354159.

The product of its (nonzero) digits is 112500, while the sum is 39.

Adding to 12135253115505 its reverse (50551135253121), we get a palindrome (62686388368626).

The spelling of 12135253115505 in words is "twelve trillion, one hundred thirty-five billion, two hundred fifty-three million, one hundred fifteen thousand, five hundred five".