163640430346249 has 2 divisors, whose sum is σ = 163640430346250. Its totient is φ = 163640430346248.

The previous prime is 163640430346241. The next prime is 163640430346303. The reversal of 163640430346249 is 942643034046361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135858676040649 + 27781754305600 = 11655843^2 + 5270840^2 .

It is a cyclic number.

It is not a de Polignac number, because 163640430346249 - 2³ = 163640430346241 is a prime.

It is a super-2 number, since 2×163640430346249² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 163640430346249.

It is not a weakly prime, because it can be changed into another prime (163640430346241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81820215173124 + 81820215173125.

It is an arithmetic number, because the mean of its divisors is an integer number (81820215173125).

Almost surely, 2^{163640430346249} is an apocalyptic number.

It is an amenable number.

163640430346249 is a deficient number, since it is larger than the sum of its proper divisors (1).

163640430346249 is an equidigital number, since it uses as much as digits as its factorization.

163640430346249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26873856, while the sum is 55.

The spelling of 163640430346249 in words is "one hundred sixty-three trillion, six hundred forty billion, four hundred thirty million, three hundred forty-six thousand, two hundred forty-nine".