27689215454969 has 4 divisors (see below), whose sum is σ = 27963366103140. Its totient is φ = 27415064806800.

The previous prime is 27689215454959. The next prime is 27689215454993. The reversal of 27689215454969 is 96945451298672.

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 18189474367744 + 9499741087225 = 4264912^2 + 3082165^2 .

It is a cyclic number.

It is not a de Polignac number, because 27689215454969 - 2⁴⁴ = 10097029410553 is a prime.

It is a super-2 number, since 2×27689215454969² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27689215454969.

It is not an unprimeable number, because it can be changed into a prime (27689215454959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137075323934 + ... + 137075324135.

It is an arithmetic number, because the mean of its divisors is an integer number (6990841525785).

Almost surely, 2^{27689215454969} is an apocalyptic number.

It is an amenable number.

27689215454969 is a deficient number, since it is larger than the sum of its proper divisors (274150648171).

27689215454969 is a wasteful number, since it uses less digits than its factorization.

27689215454969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274150648170.

The product of its digits is 2351462400, while the sum is 77.

The spelling of 27689215454969 in words is "twenty-seven trillion, six hundred eighty-nine billion, two hundred fifteen million, four hundred fifty-four thousand, nine hundred sixty-nine".