61611150509 has 2 divisors, whose sum is σ = 61611150510. Its totient is φ = 61611150508.

The previous prime is 61611150421. The next prime is 61611150533. The reversal of 61611150509 is 90505111616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42331828009 + 19279322500 = 205747^2 + 138850^2 .

It is a cyclic number.

It is not a de Polignac number, because 61611150509 - 2¹² = 61611146413 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61611150569) 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, 30805575254 + 30805575255.

It is an arithmetic number, because the mean of its divisors is an integer number (30805575255).

Almost surely, 2^61611150509 is an apocalyptic number.

It is an amenable number.

61611150509 is a deficient number, since it is larger than the sum of its proper divisors (1).

61611150509 is an equidigital number, since it uses as much as digits as its factorization.

61611150509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 35.

The spelling of 61611150509 in words is "sixty-one billion, six hundred eleven million, one hundred fifty thousand, five hundred nine".