68061101639 has 4 divisors (see below), whose sum is σ = 68206843224. Its totient is φ = 67915360056.

The previous prime is 68061101611. The next prime is 68061101653. The reversal of 68061101639 is 93610116086.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68061101639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68061101596 and 68061101605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68061101609) 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, 72870092 + ... + 72871025.

It is an arithmetic number, because the mean of its divisors is an integer number (17051710806).

Almost surely, 2^68061101639 is an apocalyptic number.

68061101639 is a deficient number, since it is larger than the sum of its proper divisors (145741585).

68061101639 is a wasteful number, since it uses less digits than its factorization.

68061101639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145741584.

The product of its (nonzero) digits is 46656, while the sum is 41.

The spelling of 68061101639 in words is "sixty-eight billion, sixty-one million, one hundred one thousand, six hundred thirty-nine".