61855933955839 has 2 divisors, whose sum is σ = 61855933955840. Its totient is φ = 61855933955838.

The previous prime is 61855933955801. The next prime is 61855933955861. The reversal of 61855933955839 is 93855933955816.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61855933955839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61855933953839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30927966977919 + 30927966977920.

It is an arithmetic number, because the mean of its divisors is an integer number (30927966977920).

Almost surely, 2^{61855933955839} is an apocalyptic number.

61855933955839 is a deficient number, since it is larger than the sum of its proper divisors (1).

61855933955839 is an equidigital number, since it uses as much as digits as its factorization.

61855933955839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4723920000, while the sum is 79.

The spelling of 61855933955839 in words is "sixty-one trillion, eight hundred fifty-five billion, nine hundred thirty-three million, nine hundred fifty-five thousand, eight hundred thirty-nine".