68657216651 has 16 divisors (see below), whose sum is σ = 74460713184. Its totient is φ = 63052813824.

The previous prime is 68657216633. The next prime is 68657216731. The reversal of 68657216651 is 15661275686.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 68657216651 - 2⁶ = 68657216587 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68657216593 and 68657216602.

It is not an unprimeable number, because it can be changed into a prime (68657266651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 694145 + ... + 786861.

It is an arithmetic number, because the mean of its divisors is an integer number (4653794574).

Almost surely, 2^68657216651 is an apocalyptic number.

68657216651 is a deficient number, since it is larger than the sum of its proper divisors (5803496533).

68657216651 is a wasteful number, since it uses less digits than its factorization.

68657216651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93790.

The product of its digits is 3628800, while the sum is 53.

The spelling of 68657216651 in words is "sixty-eight billion, six hundred fifty-seven million, two hundred sixteen thousand, six hundred fifty-one".