68738566641 has 4 divisors (see below), whose sum is σ = 91651422192. Its totient is φ = 45825711092.

The previous prime is 68738566607. The next prime is 68738566691. The reversal of 68738566641 is 14666583786.

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 68738566641 - 2¹¹ = 68738564593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68738566601) 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, 11456427771 + ... + 11456427776.

It is an arithmetic number, because the mean of its divisors is an integer number (22912855548).

Almost surely, 2^68738566641 is an apocalyptic number.

It is an amenable number.

68738566641 is a deficient number, since it is larger than the sum of its proper divisors (22912855551).

68738566641 is a wasteful number, since it uses less digits than its factorization.

68738566641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22912855550.

The product of its digits is 34836480, while the sum is 60.

The spelling of 68738566641 in words is "sixty-eight billion, seven hundred thirty-eight million, five hundred sixty-six thousand, six hundred forty-one".