51660615086849 has 2 divisors, whose sum is σ = 51660615086850. Its totient is φ = 51660615086848.

The previous prime is 51660615086819. The next prime is 51660615086887. The reversal of 51660615086849 is 94868051606615.

51660615086849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28258792810000 + 23401822276849 = 5315900^2 + 4837543^2 .

It is a cyclic number.

It is not a de Polignac number, because 51660615086849 - 2²⁸ = 51660346651393 is a prime.

It is not a weakly prime, because it can be changed into another prime (51660615086819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25830307543424 + 25830307543425.

It is an arithmetic number, because the mean of its divisors is an integer number (25830307543425).

Almost surely, 2^{51660615086849} is an apocalyptic number.

It is an amenable number.

51660615086849 is a deficient number, since it is larger than the sum of its proper divisors (1).

51660615086849 is an equidigital number, since it uses as much as digits as its factorization.

51660615086849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 74649600, while the sum is 65.

The spelling of 51660615086849 in words is "fifty-one trillion, six hundred sixty billion, six hundred fifteen million, eighty-six thousand, eight hundred forty-nine".