27786556249 has 3 divisors (see below), whose sum is σ = 27786722943. Its totient is φ = 27786389556.

The previous prime is 27786556241. The next prime is 27786556339. The reversal of 27786556249 is 94265568772.

The square root of 27786556249 is 166693.

It is a perfect power (a square), and thus also a powerful number.

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 only one way, i.e., 4520545225 + 23266011024 = 67235^2 + 152532^2 .

It is not a de Polignac number, because 27786556249 - 2³ = 27786556241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27786556241) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 83347 + ... + 250039.

It is an arithmetic number, because the mean of its divisors is an integer number (9262240981).

Almost surely, 2^27786556249 is an apocalyptic number.

27786556249 is the 166693-rd square number.

27786556249 is the 83347-th centered octagonal number.

It is an amenable number.

27786556249 is a deficient number, since it is larger than the sum of its proper divisors (166694).

27786556249 is an frugal number, since it uses more digits than its factorization.

27786556249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333386 (or 166693 counting only the distinct ones).

The product of its digits is 50803200, while the sum is 61.

The spelling of 27786556249 in words is "twenty-seven billion, seven hundred eighty-six million, five hundred fifty-six thousand, two hundred forty-nine".