16005323261 has 2 divisors, whose sum is σ = 16005323262. Its totient is φ = 16005323260.

The previous prime is 16005323171. The next prime is 16005323263. The reversal of 16005323261 is 16232350061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10968582361 + 5036740900 = 104731^2 + 70970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16005323261 is a prime.

Together with 16005323263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16005323263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8002661630 + 8002661631.

It is an arithmetic number, because the mean of its divisors is an integer number (8002661631).

Almost surely, 2^16005323261 is an apocalyptic number.

It is an amenable number.

16005323261 is a deficient number, since it is larger than the sum of its proper divisors (1).

16005323261 is an equidigital number, since it uses as much as digits as its factorization.

16005323261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The spelling of 16005323261 in words is "sixteen billion, five million, three hundred twenty-three thousand, two hundred sixty-one".