17682120649 has 2 divisors, whose sum is σ = 17682120650. Its totient is φ = 17682120648.

The previous prime is 17682120641. The next prime is 17682120653. The reversal of 17682120649 is 94602128671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17658423225 + 23697424 = 132885^2 + 4868^2 .

It is a cyclic number.

It is not a de Polignac number, because 17682120649 - 2³ = 17682120641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17682120599 and 17682120608.

It is not a weakly prime, because it can be changed into another prime (17682120641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8841060324 + 8841060325.

It is an arithmetic number, because the mean of its divisors is an integer number (8841060325).

Almost surely, 2^17682120649 is an apocalyptic number.

It is an amenable number.

17682120649 is a deficient number, since it is larger than the sum of its proper divisors (1).

17682120649 is an equidigital number, since it uses as much as digits as its factorization.

17682120649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 17682120649 in words is "seventeen billion, six hundred eighty-two million, one hundred twenty thousand, six hundred forty-nine".