16516525261 has 2 divisors, whose sum is σ = 16516525262. Its totient is φ = 16516525260.

The previous prime is 16516525217. The next prime is 16516525273. The reversal of 16516525261 is 16252561561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15387162025 + 1129363236 = 124045^2 + 33606^2 .

It is a cyclic number.

It is not a de Polignac number, because 16516525261 - 2²³ = 16508136653 is a prime.

It is a super-2 number, since 2×16516525261² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16516529261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8258262630 + 8258262631.

It is an arithmetic number, because the mean of its divisors is an integer number (8258262631).

Almost surely, 2^16516525261 is an apocalyptic number.

It is an amenable number.

16516525261 is a deficient number, since it is larger than the sum of its proper divisors (1).

16516525261 is an equidigital number, since it uses as much as digits as its factorization.

16516525261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108000, while the sum is 40.

The spelling of 16516525261 in words is "sixteen billion, five hundred sixteen million, five hundred twenty-five thousand, two hundred sixty-one".