27564312509 has 4 divisors (see below), whose sum is σ = 27817196220. Its totient is φ = 27311428800.

The previous prime is 27564312449. The next prime is 27564312521. The reversal of 27564312509 is 90521346572.

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 23285844409 + 4278468100 = 152597^2 + 65410^2 .

It is a cyclic number.

It is not a de Polignac number, because 27564312509 - 2¹⁶ = 27564246973 is a prime.

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 27564312509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27564312539) 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, 126441692 + ... + 126441909.

It is an arithmetic number, because the mean of its divisors is an integer number (6954299055).

Almost surely, 2^27564312509 is an apocalyptic number.

It is an amenable number.

27564312509 is a deficient number, since it is larger than the sum of its proper divisors (252883711).

27564312509 is a wasteful number, since it uses less digits than its factorization.

27564312509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252883710.

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 27564312509 in words is "twenty-seven billion, five hundred sixty-four million, three hundred twelve thousand, five hundred nine".