26378161 has 2 divisors, whose sum is σ = 26378162. Its totient is φ = 26378160.

The previous prime is 26378159. The next prime is 26378167. The reversal of 26378161 is 16187362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19088161 + 7290000 = 4369^2 + 2700^2 .

It is a cyclic number.

It is not a de Polignac number, because 26378161 - 2¹ = 26378159 is a prime.

Together with 26378159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (26378167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13189080 + 13189081.

It is an arithmetic number, because the mean of its divisors is an integer number (13189081).

Almost surely, 2^26378161 is an apocalyptic number.

It is an amenable number.

26378161 is a deficient number, since it is larger than the sum of its proper divisors (1).

26378161 is an equidigital number, since it uses as much as digits as its factorization.

26378161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 26378161 is about 5135.9673869681. The cubic root of 26378161 is about 297.6789818176.

The spelling of 26378161 in words is "twenty-six million, three hundred seventy-eight thousand, one hundred sixty-one".