315445453163521 has 4 divisors (see below), whose sum is σ = 315486585711700. Its totient is φ = 315404320615344.

The previous prime is 315445453163501. The next prime is 315445453163569. The reversal of 315445453163521 is 125361354544513.

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 168199629872400 + 147245823291121 = 12969180^2 + 12134489^2 .

It is a cyclic number.

It is not a de Polignac number, because 315445453163521 - 2²³ = 315445444774913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315445453163501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20566262586 + ... + 20566277923.

It is an arithmetic number, because the mean of its divisors is an integer number (78871646427925).

Almost surely, 2^{315445453163521} is an apocalyptic number.

It is an amenable number.

315445453163521 is a deficient number, since it is larger than the sum of its proper divisors (41132548179).

315445453163521 is an equidigital number, since it uses as much as digits as its factorization.

315445453163521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41132548178.

The product of its digits is 12960000, while the sum is 52.

The spelling of 315445453163521 in words is "three hundred fifteen trillion, four hundred forty-five billion, four hundred fifty-three million, one hundred sixty-three thousand, five hundred twenty-one".