27812811245 has 4 divisors (see below), whose sum is σ = 33375373500. Its totient is φ = 22250248992.

The previous prime is 27812811241. The next prime is 27812811289. The reversal of 27812811245 is 54211821872.

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 21803770921 + 6009040324 = 147661^2 + 77518^2 .

It is a cyclic number.

It is not a de Polignac number, because 27812811245 - 2² = 27812811241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27812811241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2781281120 + ... + 2781281129.

It is an arithmetic number, because the mean of its divisors is an integer number (8343843375).

Almost surely, 2^27812811245 is an apocalyptic number.

It is an amenable number.

27812811245 is a deficient number, since it is larger than the sum of its proper divisors (5562562255).

27812811245 is an equidigital number, since it uses as much as digits as its factorization.

27812811245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5562562254.

The product of its digits is 71680, while the sum is 41.

The spelling of 27812811245 in words is "twenty-seven billion, eight hundred twelve million, eight hundred eleven thousand, two hundred forty-five".