16115111081 has 2 divisors, whose sum is σ = 16115111082. Its totient is φ = 16115111080.

The previous prime is 16115111071. The next prime is 16115111093. The reversal of 16115111081 is 18011151161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14171712025 + 1943399056 = 119045^2 + 44084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16115111081 is a prime.

It is a super-3 number, since 3×16115111081³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 16115111081.

It is not a weakly prime, because it can be changed into another prime (16115111071) 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, 8057555540 + 8057555541.

It is an arithmetic number, because the mean of its divisors is an integer number (8057555541).

Almost surely, 2^16115111081 is an apocalyptic number.

It is an amenable number.

16115111081 is a deficient number, since it is larger than the sum of its proper divisors (1).

16115111081 is an equidigital number, since it uses as much as digits as its factorization.

16115111081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 26.

The spelling of 16115111081 in words is "sixteen billion, one hundred fifteen million, one hundred eleven thousand, eighty-one".