26740667521 has 4 divisors (see below), whose sum is σ = 26741012292. Its totient is φ = 26740322752.

The previous prime is 26740667519. The next prime is 26740667533. The reversal of 26740667521 is 12576604762.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13460640400 + 13280027121 = 116020^2 + 115239^2 .

It is a cyclic number.

It is not a de Polignac number, because 26740667521 - 2¹ = 26740667519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26740667321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4365 + ... + 231301.

It is an arithmetic number, because the mean of its divisors is an integer number (6685253073).

Almost surely, 2^26740667521 is an apocalyptic number.

It is an amenable number.

26740667521 is a deficient number, since it is larger than the sum of its proper divisors (344771).

26740667521 is a wasteful number, since it uses less digits than its factorization.

26740667521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344770.

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 26740667521 in words is "twenty-six billion, seven hundred forty million, six hundred sixty-seven thousand, five hundred twenty-one".