13315215506 has 4 divisors (see below), whose sum is σ = 19972823262. Its totient is φ = 6657607752.

The previous prime is 13315215503. The next prime is 13315215509. The reversal of 13315215506 is 60551251331.

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

It is an interprime number because it is at equal distance from previous prime (13315215503) and next prime (13315215509).

It can be written as a sum of positive squares in only one way, i.e., 6821273281 + 6493942225 = 82591^2 + 80585^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13315215503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328803875 + ... + 3328803878.

Almost surely, 2^13315215506 is an apocalyptic number.

13315215506 is a deficient number, since it is larger than the sum of its proper divisors (6657607756).

13315215506 is an equidigital number, since it uses as much as digits as its factorization.

13315215506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6657607755.

The product of its (nonzero) digits is 13500, while the sum is 32.

Adding to 13315215506 its reverse (60551251331), we get a palindrome (73866466837).

The spelling of 13315215506 in words is "thirteen billion, three hundred fifteen million, two hundred fifteen thousand, five hundred six".