61353136661 has 2 divisors, whose sum is σ = 61353136662. Its totient is φ = 61353136660.

The previous prime is 61353136627. The next prime is 61353136723. The reversal of 61353136661 is 16663135316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61352317636 + 819025 = 247694^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 61353136661 - 2²⁶ = 61286027797 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 (61353136601) 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, 30676568330 + 30676568331.

It is an arithmetic number, because the mean of its divisors is an integer number (30676568331).

Almost surely, 2^61353136661 is an apocalyptic number.

It is an amenable number.

61353136661 is a deficient number, since it is larger than the sum of its proper divisors (1).

61353136661 is an equidigital number, since it uses as much as digits as its factorization.

61353136661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 41.

The spelling of 61353136661 in words is "sixty-one billion, three hundred fifty-three million, one hundred thirty-six thousand, six hundred sixty-one".