68642123687 has 8 divisors (see below), whose sum is σ = 69850935792. Its totient is φ = 67443688000.

The previous prime is 68642123681. The next prime is 68642123723. The reversal of 68642123687 is 78632124686.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68642123687 - 2¹⁶ = 68642058151 is a prime.

It is a super-2 number, since 2×68642123687² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68642123681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2580758 + ... + 2607219.

It is an arithmetic number, because the mean of its divisors is an integer number (8731366974).

Almost surely, 2^68642123687 is an apocalyptic number.

68642123687 is a deficient number, since it is larger than the sum of its proper divisors (1208812105).

68642123687 is a wasteful number, since it uses less digits than its factorization.

68642123687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5188209.

The product of its digits is 4644864, while the sum is 53.

Subtracting 68642123687 from its reverse (78632124686), we obtain a palindrome (9990000999).

The spelling of 68642123687 in words is "sixty-eight billion, six hundred forty-two million, one hundred twenty-three thousand, six hundred eighty-seven".