27385972291 has 4 divisors (see below), whose sum is σ = 28269390784. Its totient is φ = 26502553800.

The previous prime is 27385972277. The next prime is 27385972307. The reversal of 27385972291 is 19227958372.

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

It is a cyclic number.

It is not a de Polignac number, because 27385972291 - 2⁹ = 27385971779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27385972241) 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, 441709200 + ... + 441709261.

It is an arithmetic number, because the mean of its divisors is an integer number (7067347696).

Almost surely, 2^27385972291 is an apocalyptic number.

27385972291 is a deficient number, since it is larger than the sum of its proper divisors (883418493).

27385972291 is an equidigital number, since it uses as much as digits as its factorization.

27385972291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883418492.

The product of its digits is 3810240, while the sum is 55.

The spelling of 27385972291 in words is "twenty-seven billion, three hundred eighty-five million, nine hundred seventy-two thousand, two hundred ninety-one".