61656525011 has 2 divisors, whose sum is σ = 61656525012. Its totient is φ = 61656525010.

The previous prime is 61656524999. The next prime is 61656525013. The reversal of 61656525011 is 11052565616.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61656525011 - 2¹⁸ = 61656262867 is a prime.

It is a Sophie Germain prime.

Together with 61656525013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61656525013) 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, 30828262505 + 30828262506.

It is an arithmetic number, because the mean of its divisors is an integer number (30828262506).

Almost surely, 2^61656525011 is an apocalyptic number.

61656525011 is a deficient number, since it is larger than the sum of its proper divisors (1).

61656525011 is an equidigital number, since it uses as much as digits as its factorization.

61656525011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 61656525011 in words is "sixty-one billion, six hundred fifty-six million, five hundred twenty-five thousand, eleven".