17888855008949 has 2 divisors, whose sum is σ = 17888855008950. Its totient is φ = 17888855008948.

The previous prime is 17888855008909. The next prime is 17888855008979. The reversal of 17888855008949 is 94980055888871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17838315472849 + 50539536100 = 4223543^2 + 224810^2 .

It is a cyclic number.

It is not a de Polignac number, because 17888855008949 - 2⁸ = 17888855008693 is a prime.

It is a super-2 number, since 2×17888855008949² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17888855008909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8944427504474 + 8944427504475.

It is an arithmetic number, because the mean of its divisors is an integer number (8944427504475).

Almost surely, 2^{17888855008949} is an apocalyptic number.

It is an amenable number.

17888855008949 is a deficient number, since it is larger than the sum of its proper divisors (1).

17888855008949 is an equidigital number, since it uses as much as digits as its factorization.

17888855008949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1857945600, while the sum is 80.

The spelling of 17888855008949 in words is "seventeen trillion, eight hundred eighty-eight billion, eight hundred fifty-five million, eight thousand, nine hundred forty-nine".