68645654687 has 2 divisors, whose sum is σ = 68645654688. Its totient is φ = 68645654686.

The previous prime is 68645654669. The next prime is 68645654711. The reversal of 68645654687 is 78645654686.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68645654687 - 2³² = 64350687391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68645854687) 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 as a sum of consecutive naturals, namely, 34322827343 + 34322827344.

It is an arithmetic number, because the mean of its divisors is an integer number (34322827344).

Almost surely, 2^68645654687 is an apocalyptic number.

68645654687 is a deficient number, since it is larger than the sum of its proper divisors (1).

68645654687 is an equidigital number, since it uses as much as digits as its factorization.

68645654687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 232243200, while the sum is 65.

Subtracting 68645654687 from its reverse (78645654686), we obtain a palindrome (9999999999).

The spelling of 68645654687 in words is "sixty-eight billion, six hundred forty-five million, six hundred fifty-four thousand, six hundred eighty-seven".