68216069551 has 4 divisors (see below), whose sum is σ = 77961222352. Its totient is φ = 58470916752.

The previous prime is 68216069539. The next prime is 68216069561. The reversal of 68216069551 is 15596061286.

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

It is a cyclic number.

It is not a de Polignac number, because 68216069551 - 2⁹ = 68216069039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68216069495 and 68216069504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68216069561) 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, 4872576390 + ... + 4872576403.

It is an arithmetic number, because the mean of its divisors is an integer number (19490305588).

Almost surely, 2^68216069551 is an apocalyptic number.

68216069551 is a deficient number, since it is larger than the sum of its proper divisors (9745152801).

68216069551 is an equidigital number, since it uses as much as digits as its factorization.

68216069551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9745152800.

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 68216069551 in words is "sixty-eight billion, two hundred sixteen million, sixty-nine thousand, five hundred fifty-one".