168719641 has 2 divisors, whose sum is σ = 168719642. Its totient is φ = 168719640.

The previous prime is 168719623. The next prime is 168719653. The reversal of 168719641 is 146917861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95257600 + 73462041 = 9760^2 + 8571^2 .

It is a cyclic number.

It is not a de Polignac number, because 168719641 - 2¹³ = 168711449 is a prime.

It is not a weakly prime, because it can be changed into another prime (168719041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84359820 + 84359821.

It is an arithmetic number, because the mean of its divisors is an integer number (84359821).

Almost surely, 2^168719641 is an apocalyptic number.

It is an amenable number.

168719641 is a deficient number, since it is larger than the sum of its proper divisors (1).

168719641 is an equidigital number, since it uses as much as digits as its factorization.

168719641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 43.

The square root of 168719641 is about 12989.2124857514. The cubic root of 168719641 is about 552.5715839901.

The spelling of 168719641 in words is "one hundred sixty-eight million, seven hundred nineteen thousand, six hundred forty-one".