6511115505161 has 2 divisors, whose sum is σ = 6511115505162. Its totient is φ = 6511115505160.

The previous prime is 6511115505137. The next prime is 6511115505199. The reversal of 6511115505161 is 1615055111156.

6511115505161 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (6511115505199) can be obtained adding 6511115505161 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4984949290000 + 1526166215161 = 2232700^2 + 1235381^2 .

It is a cyclic number.

It is not a de Polignac number, because 6511115505161 - 2²² = 6511111310857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6511115505101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3255557752580 + 3255557752581.

It is an arithmetic number, because the mean of its divisors is an integer number (3255557752581).

Almost surely, 2^{6511115505161} is an apocalyptic number.

It is an amenable number.

6511115505161 is a deficient number, since it is larger than the sum of its proper divisors (1).

6511115505161 is an equidigital number, since it uses as much as digits as its factorization.

6511115505161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 38.

The spelling of 6511115505161 in words is "six trillion, five hundred eleven billion, one hundred fifteen million, five hundred five thousand, one hundred sixty-one".