168940643 has 2 divisors, whose sum is σ = 168940644. Its totient is φ = 168940642.

The previous prime is 168940633. The next prime is 168940649. The reversal of 168940643 is 346049861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 168940643 - 2¹⁰ = 168939619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168940643.

It is not a weakly prime, because it can be changed into another prime (168940649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84470321 + 84470322.

It is an arithmetic number, because the mean of its divisors is an integer number (84470322).

Almost surely, 2^168940643 is an apocalyptic number.

168940643 is a deficient number, since it is larger than the sum of its proper divisors (1).

168940643 is an equidigital number, since it uses as much as digits as its factorization.

168940643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 168940643 is about 12997.7168379681. The cubic root of 168940643 is about 552.8127456845.

The spelling of 168940643 in words is "one hundred sixty-eight million, nine hundred forty thousand, six hundred forty-three".