68648375729 has 4 divisors (see below), whose sum is σ = 68649163584. Its totient is φ = 68647587876.

The previous prime is 68648375713. The next prime is 68648375743. The reversal of 68648375729 is 92757384686.

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 68648375729 - 2⁴ = 68648375713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68648335729) 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, 244277 + ... + 443810.

It is an arithmetic number, because the mean of its divisors is an integer number (17162290896).

Almost surely, 2^68648375729 is an apocalyptic number.

It is an amenable number.

68648375729 is a deficient number, since it is larger than the sum of its proper divisors (787855).

68648375729 is an equidigital number, since it uses as much as digits as its factorization.

68648375729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787854.

The product of its digits is 121927680, while the sum is 65.

The spelling of 68648375729 in words is "sixty-eight billion, six hundred forty-eight million, three hundred seventy-five thousand, seven hundred twenty-nine".