68340752251 has 4 divisors (see below), whose sum is σ = 68460438904. Its totient is φ = 68221065600.

The previous prime is 68340752239. The next prime is 68340752279. The reversal of 68340752251 is 15225704386.

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

It is a cyclic number.

It is not a de Polignac number, because 68340752251 - 2¹⁵ = 68340719483 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68340752198 and 68340752207.

It is not an unprimeable number, because it can be changed into a prime (68340752351) 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, 59842470 + ... + 59843611.

It is an arithmetic number, because the mean of its divisors is an integer number (17115109726).

Almost surely, 2^68340752251 is an apocalyptic number.

68340752251 is a deficient number, since it is larger than the sum of its proper divisors (119686653).

68340752251 is a wasteful number, since it uses less digits than its factorization.

68340752251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119686652.

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 68340752251 in words is "sixty-eight billion, three hundred forty million, seven hundred fifty-two thousand, two hundred fifty-one".