27643564677 has 4 divisors (see below), whose sum is σ = 36858086240. Its totient is φ = 18429043116.

The previous prime is 27643564673. The next prime is 27643564679. The reversal of 27643564677 is 77646534672.

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 not a de Polignac number, because 27643564677 - 2² = 27643564673 is a prime.

It is a super-2 number, since 2×27643564677² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27643564673) 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, 4607260777 + ... + 4607260782.

It is an arithmetic number, because the mean of its divisors is an integer number (9214521560).

Almost surely, 2^27643564677 is an apocalyptic number.

It is an amenable number.

27643564677 is a deficient number, since it is larger than the sum of its proper divisors (9214521563).

27643564677 is an equidigital number, since it uses as much as digits as its factorization.

27643564677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9214521562.

The product of its digits is 35562240, while the sum is 57.

The spelling of 27643564677 in words is "twenty-seven billion, six hundred forty-three million, five hundred sixty-four thousand, six hundred seventy-seven".