68345513 has 4 divisors (see below), whose sum is σ = 68362068. Its totient is φ = 68328960.

The previous prime is 68345477. The next prime is 68345551. The reversal of 68345513 is 31554386.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 25482304 + 42863209 = 5048^2 + 6547^2 .

It is a cyclic number.

It is not a de Polignac number, because 68345513 - 2¹² = 68341417 is a prime.

It is a super-2 number, since 2×68345513² = 9342218294466338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68395513) 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 in 3 ways as a sum of consecutive naturals, for example, 3533 + ... + 12213.

It is an arithmetic number, because the mean of its divisors is an integer number (17090517).

Almost surely, 2^68345513 is an apocalyptic number.

It is an amenable number.

68345513 is a deficient number, since it is larger than the sum of its proper divisors (16555).

68345513 is an equidigital number, since it uses as much as digits as its factorization.

68345513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16554.

The product of its digits is 43200, while the sum is 35.

The square root of 68345513 is about 8267.1345096109. The cubic root of 68345513 is about 408.8556489494.

Adding to 68345513 its reverse (31554386), we get a palindrome (99899899).

The spelling of 68345513 in words is "sixty-eight million, three hundred forty-five thousand, five hundred thirteen".