27657331657 has 4 divisors (see below), whose sum is σ = 27659394000. Its totient is φ = 27655269316.

The previous prime is 27657331609. The next prime is 27657331699. The reversal of 27657331657 is 75613375672.

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 27657331657 - 2¹⁹ = 27656807369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27657331607) 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, 1010923 + ... + 1037920.

It is an arithmetic number, because the mean of its divisors is an integer number (6914848500).

Almost surely, 2^27657331657 is an apocalyptic number.

It is an amenable number.

27657331657 is a deficient number, since it is larger than the sum of its proper divisors (2062343).

27657331657 is a wasteful number, since it uses less digits than its factorization.

27657331657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2062342.

The product of its digits is 5556600, while the sum is 52.

The spelling of 27657331657 in words is "twenty-seven billion, six hundred fifty-seven million, three hundred thirty-one thousand, six hundred fifty-seven".