27985663443 has 4 divisors (see below), whose sum is σ = 37314217928. Its totient is φ = 18657108960.

The previous prime is 27985663439. The next prime is 27985663451. The reversal of 27985663443 is 34436658972.

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

It is not a de Polignac number, because 27985663443 - 2² = 27985663439 is a prime.

It is a super-2 number, since 2×27985663443² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27985663243) 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, 4664277238 + ... + 4664277243.

It is an arithmetic number, because the mean of its divisors is an integer number (9328554482).

Almost surely, 2^27985663443 is an apocalyptic number.

27985663443 is a deficient number, since it is larger than the sum of its proper divisors (9328554485).

27985663443 is an equidigital number, since it uses as much as digits as its factorization.

27985663443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9328554484.

The product of its digits is 26127360, while the sum is 57.

The spelling of 27985663443 in words is "twenty-seven billion, nine hundred eighty-five million, six hundred sixty-three thousand, four hundred forty-three".