68741626781 has 4 divisors (see below), whose sum is σ = 69514004700. Its totient is φ = 67969248864.

The previous prime is 68741626777. The next prime is 68741626799. The reversal of 68741626781 is 18762614786.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18762614786 = 2 ⋅9381307393.

It can be written as a sum of positive squares in 2 ways, for example, as 6686332900 + 62055293881 = 81770^2 + 249109^2 .

It is a cyclic number.

It is not a de Polignac number, because 68741626781 - 2² = 68741626777 is a prime.

It is a super-2 number, since 2×68741626781² (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 (68741626381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386188826 + ... + 386189003.

It is an arithmetic number, because the mean of its divisors is an integer number (17378501175).

Almost surely, 2^68741626781 is an apocalyptic number.

It is an amenable number.

68741626781 is a deficient number, since it is larger than the sum of its proper divisors (772377919).

68741626781 is an equidigital number, since it uses as much as digits as its factorization.

68741626781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772377918.

The product of its digits is 5419008, while the sum is 56.

The spelling of 68741626781 in words is "sixty-eight billion, seven hundred forty-one million, six hundred twenty-six thousand, seven hundred eighty-one".