163640693 has 2 divisors, whose sum is σ = 163640694. Its totient is φ = 163640692.

The previous prime is 163640641. The next prime is 163640761. The reversal of 163640693 is 396046361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159946609 + 3694084 = 12647^2 + 1922^2 .

It is a cyclic number.

It is not a de Polignac number, because 163640693 - 2¹⁶ = 163575157 is a prime.

It is equal to p_9167177 and since 163640693 and 9167177 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163640593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81820346 + 81820347.

It is an arithmetic number, because the mean of its divisors is an integer number (81820347).

Almost surely, 2^163640693 is an apocalyptic number.

It is an amenable number.

163640693 is a deficient number, since it is larger than the sum of its proper divisors (1).

163640693 is an equidigital number, since it uses as much as digits as its factorization.

163640693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 38.

The square root of 163640693 is about 12792.2122011793. The cubic root of 163640693 is about 546.9703312797.

The spelling of 163640693 in words is "one hundred sixty-three million, six hundred forty thousand, six hundred ninety-three".