27646546621 has 4 divisors (see below), whose sum is σ = 27647044992. Its totient is φ = 27646048252.

The previous prime is 27646546583. The next prime is 27646546649. The reversal of 27646546621 is 12664564672.

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 27646546621 - 2²³ = 27638158013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27646546661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153805 + ... + 280978.

It is an arithmetic number, because the mean of its divisors is an integer number (6911761248).

Almost surely, 2^27646546621 is an apocalyptic number.

It is an amenable number.

27646546621 is a deficient number, since it is larger than the sum of its proper divisors (498371).

27646546621 is an equidigital number, since it uses as much as digits as its factorization.

27646546621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498370.

The product of its digits is 2903040, while the sum is 49.

The spelling of 27646546621 in words is "twenty-seven billion, six hundred forty-six million, five hundred forty-six thousand, six hundred twenty-one".