51515115655111 has 2 divisors, whose sum is σ = 51515115655112. Its totient is φ = 51515115655110.

The previous prime is 51515115655097. The next prime is 51515115655121. The reversal of 51515115655111 is 11155651151515.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51515115655111 - 2⁹ = 51515115654599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51515115655121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25757557827555 + 25757557827556.

It is an arithmetic number, because the mean of its divisors is an integer number (25757557827556).

Almost surely, 2^{51515115655111} is an apocalyptic number.

51515115655111 is a deficient number, since it is larger than the sum of its proper divisors (1).

51515115655111 is an equidigital number, since it uses as much as digits as its factorization.

51515115655111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93750, while the sum is 43.

The spelling of 51515115655111 in words is "fifty-one trillion, five hundred fifteen billion, one hundred fifteen million, six hundred fifty-five thousand, one hundred eleven".