26774476721 has 4 divisors (see below), whose sum is σ = 26843306100. Its totient is φ = 26705647344.

The previous prime is 26774476679. The next prime is 26774476739. The reversal of 26774476721 is 12767447762.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18526204321 + 8248272400 = 136111^2 + 90820^2 .

It is a cyclic number.

It is not a de Polignac number, because 26774476721 - 2⁶ = 26774476657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26774476921) 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 in 3 ways as a sum of consecutive naturals, for example, 34414106 + ... + 34414883.

It is an arithmetic number, because the mean of its divisors is an integer number (6710826525).

Almost surely, 2^26774476721 is an apocalyptic number.

It is an amenable number.

26774476721 is a deficient number, since it is larger than the sum of its proper divisors (68829379).

26774476721 is an equidigital number, since it uses as much as digits as its factorization.

26774476721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68829378.

The product of its digits is 5531904, while the sum is 53.

The spelling of 26774476721 in words is "twenty-six billion, seven hundred seventy-four million, four hundred seventy-six thousand, seven hundred twenty-one".