61916460125209 has 2 divisors, whose sum is σ = 61916460125210. Its totient is φ = 61916460125208.

The previous prime is 61916460125207. The next prime is 61916460125213. The reversal of 61916460125209 is 90252106461916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51797571884809 + 10118888240400 = 7197053^2 + 3181020^2 .

It is a cyclic number.

It is not a de Polignac number, because 61916460125209 - 2¹ = 61916460125207 is a prime.

Together with 61916460125207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61916460125203) 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, 30958230062604 + 30958230062605.

It is an arithmetic number, because the mean of its divisors is an integer number (30958230062605).

Almost surely, 2^{61916460125209} is an apocalyptic number.

It is an amenable number.

61916460125209 is a deficient number, since it is larger than the sum of its proper divisors (1).

61916460125209 is an equidigital number, since it uses as much as digits as its factorization.

61916460125209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 61916460125209 in words is "sixty-one trillion, nine hundred sixteen billion, four hundred sixty million, one hundred twenty-five thousand, two hundred nine".