61550126009 has 2 divisors, whose sum is σ = 61550126010. Its totient is φ = 61550126008.

The previous prime is 61550125981. The next prime is 61550126059. The reversal of 61550126009 is 90062105516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61466805625 + 83320384 = 247925^2 + 9128^2 .

It is a cyclic number.

It is not a de Polignac number, because 61550126009 - 2⁸ = 61550125753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61550126009.

It is not a weakly prime, because it can be changed into another prime (61550126059) 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, 30775063004 + 30775063005.

It is an arithmetic number, because the mean of its divisors is an integer number (30775063005).

Almost surely, 2^61550126009 is an apocalyptic number.

It is an amenable number.

61550126009 is a deficient number, since it is larger than the sum of its proper divisors (1).

61550126009 is an equidigital number, since it uses as much as digits as its factorization.

61550126009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 35.

The spelling of 61550126009 in words is "sixty-one billion, five hundred fifty million, one hundred twenty-six thousand, nine".