68350072561 has 4 divisors (see below), whose sum is σ = 69804329472. Its totient is φ = 66895815652.

The previous prime is 68350072547. The next prime is 68350072589. The reversal of 68350072561 is 16527005386.

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 68350072561 - 2¹¹ = 68350070513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68350078561) 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, 727128385 + ... + 727128478.

It is an arithmetic number, because the mean of its divisors is an integer number (17451082368).

Almost surely, 2^68350072561 is an apocalyptic number.

It is an amenable number.

68350072561 is a deficient number, since it is larger than the sum of its proper divisors (1454256911).

68350072561 is a wasteful number, since it uses less digits than its factorization.

68350072561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454256910.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 68350072561 in words is "sixty-eight billion, three hundred fifty million, seventy-two thousand, five hundred sixty-one".