675205649 has 2 divisors, whose sum is σ = 675205650. Its totient is φ = 675205648.

The previous prime is 675205639. The next prime is 675205667. The reversal of 675205649 is 946502576.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 462250000 + 212955649 = 21500^2 + 14593^2 .

It is a cyclic number.

It is not a de Polignac number, because 675205649 - 2¹⁶ = 675140113 is a prime.

It is a super-2 number, since 2×675205649² = 911805336883022402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (675205639) 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, 337602824 + 337602825.

It is an arithmetic number, because the mean of its divisors is an integer number (337602825).

Almost surely, 2^675205649 is an apocalyptic number.

It is an amenable number.

675205649 is a deficient number, since it is larger than the sum of its proper divisors (1).

675205649 is an equidigital number, since it uses as much as digits as its factorization.

675205649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 44.

The square root of 675205649 is about 25984.7195289847. The cubic root of 675205649 is about 877.2943970590.

The spelling of 675205649 in words is "six hundred seventy-five million, two hundred five thousand, six hundred forty-nine".