27134252561 has 4 divisors (see below), whose sum is σ = 29221502772. Its totient is φ = 25047002352.

The previous prime is 27134252557. The next prime is 27134252591. The reversal of 27134252561 is 16525243172.

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 18675955600 + 8458296961 = 136660^2 + 91969^2 .

It is a cyclic number.

It is not a de Polignac number, because 27134252561 - 2² = 27134252557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27134252521) 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, 1043625086 + ... + 1043625111.

It is an arithmetic number, because the mean of its divisors is an integer number (7305375693).

Almost surely, 2^27134252561 is an apocalyptic number.

It is an amenable number.

27134252561 is a deficient number, since it is larger than the sum of its proper divisors (2087250211).

27134252561 is a wasteful number, since it uses less digits than its factorization.

27134252561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2087250210.

The product of its digits is 100800, while the sum is 38.

The spelling of 27134252561 in words is "twenty-seven billion, one hundred thirty-four million, two hundred fifty-two thousand, five hundred sixty-one".