168640061651 has 2 divisors, whose sum is σ = 168640061652. Its totient is φ = 168640061650.

The previous prime is 168640061633. The next prime is 168640061669. The reversal of 168640061651 is 156160046861.

168640061651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (168640061633) and next prime (168640061669).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168640061651 is a prime.

It is not a weakly prime, because it can be changed into another prime (168640061351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84320030825 + 84320030826.

It is an arithmetic number, because the mean of its divisors is an integer number (84320030826).

Almost surely, 2^168640061651 is an apocalyptic number.

168640061651 is a deficient number, since it is larger than the sum of its proper divisors (1).

168640061651 is an equidigital number, since it uses as much as digits as its factorization.

168640061651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 168640061651 in words is "one hundred sixty-eight billion, six hundred forty million, sixty-one thousand, six hundred fifty-one".