26727874561 has 2 divisors, whose sum is σ = 26727874562. Its totient is φ = 26727874560.

The previous prime is 26727874559. The next prime is 26727874573. The reversal of 26727874561 is 16547872762.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23522050161 + 3205824400 = 153369^2 + 56620^2 .

It is a cyclic number.

It is not a de Polignac number, because 26727874561 - 2¹ = 26727874559 is a prime.

Together with 26727874559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (26727874361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13363937280 + 13363937281.

It is an arithmetic number, because the mean of its divisors is an integer number (13363937281).

Almost surely, 2^26727874561 is an apocalyptic number.

It is an amenable number.

26727874561 is a deficient number, since it is larger than the sum of its proper divisors (1).

26727874561 is an equidigital number, since it uses as much as digits as its factorization.

26727874561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7902720, while the sum is 55.

The spelling of 26727874561 in words is "twenty-six billion, seven hundred twenty-seven million, eight hundred seventy-four thousand, five hundred sixty-one".