163640077 has 2 divisors, whose sum is σ = 163640078. Its totient is φ = 163640076.

The previous prime is 163640053. The next prime is 163640083. The reversal of 163640077 is 770046361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132848676 + 30791401 = 11526^2 + 5549^2 .

It is a cyclic number.

It is not a de Polignac number, because 163640077 - 2¹¹ = 163638029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163640017) 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, 81820038 + 81820039.

It is an arithmetic number, because the mean of its divisors is an integer number (81820039).

Almost surely, 2^163640077 is an apocalyptic number.

It is an amenable number.

163640077 is a deficient number, since it is larger than the sum of its proper divisors (1).

163640077 is an equidigital number, since it uses as much as digits as its factorization.

163640077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 163640077 is about 12792.1881240076. The cubic root of 163640077 is about 546.9696449505.

The spelling of 163640077 in words is "one hundred sixty-three million, six hundred forty thousand, seventy-seven".