27388564651 has 12 divisors (see below), whose sum is σ = 31999307520. Its totient is φ = 23373388080.

The previous prime is 27388564631. The next prime is 27388564661. The reversal of 27388564651 is 15646588372.

It is a happy number.

It is not a de Polignac number, because 27388564651 - 2¹¹ = 27388562603 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27388564592 and 27388564601.

It is not an unprimeable number, because it can be changed into a prime (27388564631) 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 11 ways as a sum of consecutive naturals, for example, 1209195 + ... + 1231636.

It is an arithmetic number, because the mean of its divisors is an integer number (2666608960).

Almost surely, 2^27388564651 is an apocalyptic number.

27388564651 is a deficient number, since it is larger than the sum of its proper divisors (4610742869).

27388564651 is a wasteful number, since it uses less digits than its factorization.

27388564651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2441074 (or 2441067 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 55.

The spelling of 27388564651 in words is "twenty-seven billion, three hundred eighty-eight million, five hundred sixty-four thousand, six hundred fifty-one".