12171635153 has 4 divisors (see below), whose sum is σ = 12591346740. Its totient is φ = 11751923568.

The previous prime is 12171635137. The next prime is 12171635221. The reversal of 12171635153 is 35153617121.

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 4410553744 + 7761081409 = 66412^2 + 88097^2 .

It is a cyclic number.

It is not a de Polignac number, because 12171635153 - 2⁴ = 12171635137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12171635053) 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 3 ways as a sum of consecutive naturals, for example, 209855750 + ... + 209855807.

It is an arithmetic number, because the mean of its divisors is an integer number (3147836685).

Almost surely, 2^12171635153 is an apocalyptic number.

It is an amenable number.

12171635153 is a deficient number, since it is larger than the sum of its proper divisors (419711587).

12171635153 is an equidigital number, since it uses as much as digits as its factorization.

12171635153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419711586.

The product of its digits is 18900, while the sum is 35.

The spelling of 12171635153 in words is "twelve billion, one hundred seventy-one million, six hundred thirty-five thousand, one hundred fifty-three".