12517161553 has 4 divisors (see below), whose sum is σ = 13480020148. Its totient is φ = 11554302960.

The previous prime is 12517161551. The next prime is 12517161571. The reversal of 12517161553 is 35516171521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5450573584 + 7066587969 = 73828^2 + 84063^2 .

It is a cyclic number.

It is not a de Polignac number, because 12517161553 - 2¹ = 12517161551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12517161551) 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, 481429278 + ... + 481429303.

It is an arithmetic number, because the mean of its divisors is an integer number (3370005037).

Almost surely, 2^12517161553 is an apocalyptic number.

12517161553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12517161553 is a deficient number, since it is larger than the sum of its proper divisors (962858595).

12517161553 is an equidigital number, since it uses as much as digits as its factorization.

12517161553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962858594.

The product of its digits is 31500, while the sum is 37.

The spelling of 12517161553 in words is "twelve billion, five hundred seventeen million, one hundred sixty-one thousand, five hundred fifty-three".