68811761851 has 4 divisors (see below), whose sum is σ = 78642013552. Its totient is φ = 58981510152.

The previous prime is 68811761827. The next prime is 68811761857. The reversal of 68811761851 is 15816711886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15816711886 = 2 ⋅7908355943.

It is a cyclic number.

It is not a de Polignac number, because 68811761851 - 2⁷ = 68811761723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68811761857) 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, 4915125840 + ... + 4915125853.

It is an arithmetic number, because the mean of its divisors is an integer number (19660503388).

Almost surely, 2^68811761851 is an apocalyptic number.

68811761851 is the 151451-st hex number.

68811761851 is a deficient number, since it is larger than the sum of its proper divisors (9830251701).

68811761851 is an equidigital number, since it uses as much as digits as its factorization.

68811761851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9830251700.

The product of its digits is 645120, while the sum is 52.

The spelling of 68811761851 in words is "sixty-eight billion, eight hundred eleven million, seven hundred sixty-one thousand, eight hundred fifty-one".