16601518081 has 2 divisors, whose sum is σ = 16601518082. Its totient is φ = 16601518080.

The previous prime is 16601518067. The next prime is 16601518093. The reversal of 16601518081 is 18081510661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14547978225 + 2053539856 = 120615^2 + 45316^2 .

It is a cyclic number.

It is not a de Polignac number, because 16601518081 - 2⁷ = 16601517953 is a prime.

It is a super-2 number, since 2×16601518081² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16601518081.

It is not a weakly prime, because it can be changed into another prime (16601515081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8300759040 + 8300759041.

It is an arithmetic number, because the mean of its divisors is an integer number (8300759041).

Almost surely, 2^16601518081 is an apocalyptic number.

It is an amenable number.

16601518081 is a deficient number, since it is larger than the sum of its proper divisors (1).

16601518081 is an equidigital number, since it uses as much as digits as its factorization.

16601518081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 37.

The spelling of 16601518081 in words is "sixteen billion, six hundred one million, five hundred eighteen thousand, eighty-one".