168732438649 has 2 divisors, whose sum is σ = 168732438650. Its totient is φ = 168732438648.

The previous prime is 168732438599. The next prime is 168732438671. The reversal of 168732438649 is 946834237861.

168732438649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143210778624 + 25521660025 = 378432^2 + 159755^2 .

It is a cyclic number.

It is not a de Polignac number, because 168732438649 - 2⁹ = 168732438137 is a prime.

It is not a weakly prime, because it can be changed into another prime (168732438349) 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, 84366219324 + 84366219325.

It is an arithmetic number, because the mean of its divisors is an integer number (84366219325).

Almost surely, 2^168732438649 is an apocalyptic number.

It is an amenable number.

168732438649 is a deficient number, since it is larger than the sum of its proper divisors (1).

168732438649 is an equidigital number, since it uses as much as digits as its factorization.

168732438649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41803776, while the sum is 61.

The spelling of 168732438649 in words is "one hundred sixty-eight billion, seven hundred thirty-two million, four hundred thirty-eight thousand, six hundred forty-nine".