68719476721 has 4 divisors (see below), whose sum is σ = 78536544832. Its totient is φ = 58902408612.

The previous prime is 68719476719. The next prime is 68719476731. The reversal of 68719476721 is 12767491786.

It is a happy number.

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 68719476721 - 2¹ = 68719476719 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8 and base 16.

It is not an unprimeable number, because it can be changed into a prime (68719476731) 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, 4908534045 + ... + 4908534058.

It is an arithmetic number, because the mean of its divisors is an integer number (19634136208).

Almost surely, 2^68719476721 is an apocalyptic number.

It is an amenable number.

68719476721 is a deficient number, since it is larger than the sum of its proper divisors (9817068111).

68719476721 is an equidigital number, since it uses as much as digits as its factorization.

68719476721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9817068110.

The product of its digits is 7112448, while the sum is 58.

The spelling of 68719476721 in words is "sixty-eight billion, seven hundred nineteen million, four hundred seventy-six thousand, seven hundred twenty-one".