68216706561 has 8 divisors (see below), whose sum is σ = 91977582240. Its totient is φ = 44966817632.

The previous prime is 68216706559. The next prime is 68216706577. The reversal of 68216706561 is 16560761286.

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 68216706561 - 2¹ = 68216706559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68216706561.

It is not an unprimeable number, because it can be changed into a prime (68216706511) 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, 127746375 + ... + 127746908.

It is an arithmetic number, because the mean of its divisors is an integer number (11497197780).

Almost surely, 2^68216706561 is an apocalyptic number.

It is an amenable number.

68216706561 is a deficient number, since it is larger than the sum of its proper divisors (23760875679).

68216706561 is a wasteful number, since it uses less digits than its factorization.

68216706561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255493375.

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 68216706561 in words is "sixty-eight billion, two hundred sixteen million, seven hundred six thousand, five hundred sixty-one".