16400308600261 has 2 divisors, whose sum is σ = 16400308600262. Its totient is φ = 16400308600260.

The previous prime is 16400308600201. The next prime is 16400308600289. The reversal of 16400308600261 is 16200680300461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14965988588100 + 1434320012161 = 3868590^2 + 1197631^2 .

It is a cyclic number.

It is not a de Polignac number, because 16400308600261 - 2²⁵ = 16400275045829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16400308600261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16400308600201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8200154300130 + 8200154300131.

It is an arithmetic number, because the mean of its divisors is an integer number (8200154300131).

Almost surely, 2^{16400308600261} is an apocalyptic number.

It is an amenable number.

16400308600261 is a deficient number, since it is larger than the sum of its proper divisors (1).

16400308600261 is an equidigital number, since it uses as much as digits as its factorization.

16400308600261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 16400308600261 in words is "sixteen trillion, four hundred billion, three hundred eight million, six hundred thousand, two hundred sixty-one".