27571324561 has 4 divisors (see below), whose sum is σ = 30077808624. Its totient is φ = 25064840500.

The previous prime is 27571324559. The next prime is 27571324607. The reversal of 27571324561 is 16542317572.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 27571324561 - 2¹ = 27571324559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27571324531) 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, 1253242015 + ... + 1253242036.

It is an arithmetic number, because the mean of its divisors is an integer number (7519452156).

Almost surely, 2^27571324561 is an apocalyptic number.

It is an amenable number.

27571324561 is a deficient number, since it is larger than the sum of its proper divisors (2506484063).

27571324561 is a wasteful number, since it uses less digits than its factorization.

27571324561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506484062.

The product of its digits is 352800, while the sum is 43.

The spelling of 27571324561 in words is "twenty-seven billion, five hundred seventy-one million, three hundred twenty-four thousand, five hundred sixty-one".