61856618107 has 2 divisors, whose sum is σ = 61856618108. Its totient is φ = 61856618106.

The previous prime is 61856618077. The next prime is 61856618111. The reversal of 61856618107 is 70181665816.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61856618107 is a prime.

It is not a weakly prime, because it can be changed into another prime (61856612107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30928309053 + 30928309054.

It is an arithmetic number, because the mean of its divisors is an integer number (30928309054).

Almost surely, 2^61856618107 is an apocalyptic number.

61856618107 is a deficient number, since it is larger than the sum of its proper divisors (1).

61856618107 is an equidigital number, since it uses as much as digits as its factorization.

61856618107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 61856618107 in words is "sixty-one billion, eight hundred fifty-six million, six hundred eighteen thousand, one hundred seven".