68263442813 has 8 divisors (see below), whose sum is σ = 69652502520. Its totient is φ = 66883092480.

The previous prime is 68263442791. The next prime is 68263442837. The reversal of 68263442813 is 31824436286.

It can be written as a sum of positive squares in 4 ways, for example, as 7866448249 + 60396994564 = 88693^2 + 245758^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68263442813 - 2¹² = 68263438717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68263432813) 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 7 ways as a sum of consecutive naturals, for example, 2161508 + ... + 2192861.

It is an arithmetic number, because the mean of its divisors is an integer number (8706562815).

Almost surely, 2^68263442813 is an apocalyptic number.

It is an amenable number.

68263442813 is a deficient number, since it is larger than the sum of its proper divisors (1389059707).

68263442813 is a wasteful number, since it uses less digits than its factorization.

68263442813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4354687.

The product of its digits is 1327104, while the sum is 47.

The spelling of 68263442813 in words is "sixty-eight billion, two hundred sixty-three million, four hundred forty-two thousand, eight hundred thirteen".