51550111087 has 2 divisors, whose sum is σ = 51550111088. Its totient is φ = 51550111086.

The previous prime is 51550111061. The next prime is 51550111097. The reversal of 51550111087 is 78011105515.

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-51550111087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51550111027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25775055543 + 25775055544.

It is an arithmetic number, because the mean of its divisors is an integer number (25775055544).

Almost surely, 2^51550111087 is an apocalyptic number.

51550111087 is a deficient number, since it is larger than the sum of its proper divisors (1).

51550111087 is an equidigital number, since it uses as much as digits as its factorization.

51550111087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7000, while the sum is 34.

The spelling of 51550111087 in words is "fifty-one billion, five hundred fifty million, one hundred eleven thousand, eighty-seven".