12171738353513 has 4 divisors (see below), whose sum is σ = 12172082933760. Its totient is φ = 12171393773268.

The previous prime is 12171738353471. The next prime is 12171738353587. The reversal of 12171738353513 is 31535383717121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12171738353513 - 2¹² = 12171738349417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12171738353813) 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, 172237133 + ... + 172307786.

It is an arithmetic number, because the mean of its divisors is an integer number (3043020733440).

Almost surely, 2^{12171738353513} is an apocalyptic number.

It is an amenable number.

12171738353513 is a deficient number, since it is larger than the sum of its proper divisors (344580247).

12171738353513 is an equidigital number, since it uses as much as digits as its factorization.

12171738353513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344580246.

The product of its digits is 1587600, while the sum is 50.

The spelling of 12171738353513 in words is "twelve trillion, one hundred seventy-one billion, seven hundred thirty-eight million, three hundred fifty-three thousand, five hundred thirteen".