7755898561 has 2 divisors, whose sum is σ = 7755898562. Its totient is φ = 7755898560.

The previous prime is 7755898541. The next prime is 7755898571. The reversal of 7755898561 is 1658985577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7409938561 + 345960000 = 86081^2 + 18600^2 .

It is an emirp because it is prime and its reverse (1658985577) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7755898561 - 2¹¹ = 7755896513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7755898561.

It is not a weakly prime, because it can be changed into another prime (7755898541) 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, 3877949280 + 3877949281.

It is an arithmetic number, because the mean of its divisors is an integer number (3877949281).

Almost surely, 2^7755898561 is an apocalyptic number.

It is an amenable number.

7755898561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7755898561 is an equidigital number, since it uses as much as digits as its factorization.

7755898561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168000, while the sum is 61.

The square root of 7755898561 is about 88067.5795114184. The cubic root of 7755898561 is about 1979.4477391351.

The spelling of 7755898561 in words is "seven billion, seven hundred fifty-five million, eight hundred ninety-eight thousand, five hundred sixty-one".