61538758289 has 2 divisors, whose sum is σ = 61538758290. Its totient is φ = 61538758288.

The previous prime is 61538758279. The next prime is 61538758343. The reversal of 61538758289 is 98285783516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56410050064 + 5128708225 = 237508^2 + 71615^2 .

It is a cyclic number.

It is not a de Polignac number, because 61538758289 - 2¹⁶ = 61538692753 is a prime.

It is not a weakly prime, because it can be changed into another prime (61538758219) 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, 30769379144 + 30769379145.

It is an arithmetic number, because the mean of its divisors is an integer number (30769379145).

Almost surely, 2^61538758289 is an apocalyptic number.

It is an amenable number.

61538758289 is a deficient number, since it is larger than the sum of its proper divisors (1).

61538758289 is an equidigital number, since it uses as much as digits as its factorization.

61538758289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29030400, while the sum is 62.

The spelling of 61538758289 in words is "sixty-one billion, five hundred thirty-eight million, seven hundred fifty-eight thousand, two hundred eighty-nine".