27813979569 has 4 divisors (see below), whose sum is σ = 37085306096. Its totient is φ = 18542653044.

The previous prime is 27813979513. The next prime is 27813979573. The reversal of 27813979569 is 96597931872.

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 27813979569 - 2¹³ = 27813971377 is a prime.

It is a super-2 number, since 2×27813979569² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27813979579) 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, 4635663259 + ... + 4635663264.

It is an arithmetic number, because the mean of its divisors is an integer number (9271326524).

Almost surely, 2^27813979569 is an apocalyptic number.

It is an amenable number.

27813979569 is a deficient number, since it is larger than the sum of its proper divisors (9271326527).

27813979569 is an equidigital number, since it uses as much as digits as its factorization.

27813979569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9271326526.

The product of its digits is 51438240, while the sum is 66.

The spelling of 27813979569 in words is "twenty-seven billion, eight hundred thirteen million, nine hundred seventy-nine thousand, five hundred sixty-nine".