27551464561 has 4 divisors (see below), whose sum is σ = 27808954992. Its totient is φ = 27293974132.

The previous prime is 27551464553. The next prime is 27551464571. The reversal of 27551464561 is 16546415572.

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 27551464561 - 2³ = 27551464553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27551464571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128745055 + ... + 128745268.

It is an arithmetic number, because the mean of its divisors is an integer number (6952238748).

Almost surely, 2^27551464561 is an apocalyptic number.

It is an amenable number.

27551464561 is a deficient number, since it is larger than the sum of its proper divisors (257490431).

27551464561 is a wasteful number, since it uses less digits than its factorization.

27551464561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257490430.

The product of its digits is 1008000, while the sum is 46.

The spelling of 27551464561 in words is "twenty-seven billion, five hundred fifty-one million, four hundred sixty-four thousand, five hundred sixty-one".