27642137664547 has 4 divisors (see below), whose sum is σ = 31591014473776. Its totient is φ = 23693260855320.

The previous prime is 27642137664523. The next prime is 27642137664587. The reversal of 27642137664547 is 74546673124672.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 27642137664547 - 2¹¹ = 27642137662499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27642137664517) 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, 1974438404604 + ... + 1974438404617.

It is an arithmetic number, because the mean of its divisors is an integer number (7897753618444).

Almost surely, 2^{27642137664547} is an apocalyptic number.

27642137664547 is a deficient number, since it is larger than the sum of its proper divisors (3948876809229).

27642137664547 is an equidigital number, since it uses as much as digits as its factorization.

27642137664547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3948876809228.

The product of its digits is 284497920, while the sum is 64.

The spelling of 27642137664547 in words is "twenty-seven trillion, six hundred forty-two billion, one hundred thirty-seven million, six hundred sixty-four thousand, five hundred forty-seven".