61224478613 has 2 divisors, whose sum is σ = 61224478614. Its totient is φ = 61224478612.

The previous prime is 61224478537. The next prime is 61224478669. The reversal of 61224478613 is 31687442216.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55178949604 + 6045529009 = 234902^2 + 77753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61224478613 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 (61224778613) 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, 30612239306 + 30612239307.

It is an arithmetic number, because the mean of its divisors is an integer number (30612239307).

Almost surely, 2^61224478613 is an apocalyptic number.

It is an amenable number.

61224478613 is a deficient number, since it is larger than the sum of its proper divisors (1).

61224478613 is an equidigital number, since it uses as much as digits as its factorization.

61224478613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 44.

The spelling of 61224478613 in words is "sixty-one billion, two hundred twenty-four million, four hundred seventy-eight thousand, six hundred thirteen".