27771248649 has 4 divisors (see below), whose sum is σ = 37028331536. Its totient is φ = 18514165764.

The previous prime is 27771248641. The next prime is 27771248651. The reversal of 27771248649 is 94684217772.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 27771248649 - 2³ = 27771248641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27771248641) 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, 4628541439 + ... + 4628541444.

It is an arithmetic number, because the mean of its divisors is an integer number (9257082884).

Almost surely, 2^27771248649 is an apocalyptic number.

It is an amenable number.

27771248649 is a deficient number, since it is larger than the sum of its proper divisors (9257082887).

27771248649 is an equidigital number, since it uses as much as digits as its factorization.

27771248649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9257082886.

The product of its digits is 9483264, while the sum is 57.

The spelling of 27771248649 in words is "twenty-seven billion, seven hundred seventy-one million, two hundred forty-eight thousand, six hundred forty-nine".