61071616907209 has 2 divisors, whose sum is σ = 61071616907210. Its totient is φ = 61071616907208.

The previous prime is 61071616907201. The next prime is 61071616907233. The reversal of 61071616907209 is 90270961617016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60776789626809 + 294827280400 = 7795947^2 + 542980^2 .

It is a cyclic number.

It is not a de Polignac number, because 61071616907209 - 2³ = 61071616907201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61071616907209.

It is not a weakly prime, because it can be changed into another prime (61071616907201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30535808453604 + 30535808453605.

It is an arithmetic number, because the mean of its divisors is an integer number (30535808453605).

Almost surely, 2^{61071616907209} is an apocalyptic number.

It is an amenable number.

61071616907209 is a deficient number, since it is larger than the sum of its proper divisors (1).

61071616907209 is an equidigital number, since it uses as much as digits as its factorization.

61071616907209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1714608, while the sum is 55.

The spelling of 61071616907209 in words is "sixty-one trillion, seventy-one billion, six hundred sixteen million, nine hundred seven thousand, two hundred nine".